Malicious PDF — malware analysis report

Static analysis result for SHA-256 d72bed166f88a1fa…

MALICIOUS

PDF

48.2 KB Created: 2020-10-20 08:39:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: fc5445da2da28017dcc056b7e3332e05 SHA-1: 0016c2e6d13d953f60474490a2ce08eff75b5b39 SHA-256: d72bed166f88a1fa0135f415f42444b932fdc90730e4ba72a98e7b9c258cb5ec
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect the user to malicious content, likely as a first stage for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.me/123?keyword=organizational+communication+types+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366360/normal_5f871d6459ff8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377674/normal_5f89f7a8eb6a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366343/normal_5f89b5e8d7f77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365542/normal_5f887c6f49a8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374860/normal_5f8bc046cd034.pdfIn PDF document text
    • https://fidegobopoj.weebly.com/uploads/1/3/2/8/132815019/9028306.pdfIn PDF document text
    • https://vezorobabuwej.weebly.com/uploads/1/3/0/9/130969079/474c2b722880888.pdfIn PDF document text
    • https://naroxelilokatud.weebly.com/uploads/1/3/1/3/131384214/cdc239e036.pdfIn PDF document text
    • https://xogexemufak.weebly.com/uploads/1/3/1/4/131437987/8ce4384d566a.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/xereromejiv-koxozirusoror-moxonujis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365649/normal_5f87487ca3732.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368265/normal_5f87713f6d117.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371788/normal_5f8962eba3252.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366011/normal_5f890e7dc32e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378834/normal_5f8a1b39a3ec0.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/dbbd04.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/kizerapu.pdfIn PDF document text
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/podufolagevonu_moxedogepulakus_rutapud.pdfIn PDF document text
    • https://mojivimimujovo.weebly.com/uploads/1/3/0/8/130874437/batagebexi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379855/normal_5f8a8896404da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370052/normal_5f8c678b45033.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366399/normal_5f8752e08a519.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371788/normal_5f8a719914841.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/e09a1817-e99e-4d4c-b764-e539bac152f3/wesuxudam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9e14f11-0dbf-4cc1-abc3-c4d331545748/12152830713.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f7ce6ea-545f-4e9d-a7d3-ddd07baf838e/zetorakuwiwimika.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/249c4e7a-671e-4401-b539-a9e73368f57a/gisapuketigarodedizuvop.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7130 5536 bytes
SHA-256: 30a421710749d179b67aa0c8f6336ea2ff3ca05e3820b2e4f939918a798e89e9
font_01_sfnt_off000083f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83F6 9564 bytes
SHA-256: 7caef93488808ada7203da1104e46d6c087434085335d7c53b81dba1ccb9c036
font_02_sfnt_off0000a495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA495 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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