Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc61837b390df43f…

MALICIOUS

PDF

50.0 KB Created: 2020-11-08 22:46:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 6d92386c814c52f19299f82431624fb2 SHA-1: 1b53001e1110d727dd2dddfdffdbc2bce6e2b4ac SHA-256: dc61837b390df43f125c4844b140c411a84a3c044fa57029999e495978038df4
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to other PDF documents hosted on various external sites. One of these links, 'https://traffine.ru/123?keyword=ectomorph+body+type', is identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document's primary function appears to be acting as a link farm, potentially to distribute malicious content or engage in SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://traffine.ru/123?keyword=ectomorph+body+type In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366405/normal_5f8733391bab6.pdfIn PDF document text
    • https://noloturajikule.weebly.com/uploads/1/3/4/4/134486045/4838493.pdfIn PDF document text
    • https://tejovobomogopiz.weebly.com/uploads/1/3/4/6/134626725/219144a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393502/normal_5f9a0b4814aa8.pdfIn PDF document text
    • https://tidemipevu.weebly.com/uploads/1/3/0/7/130740592/5842875.pdfIn PDF document text
    • https://zugogulubituwo.weebly.com/uploads/1/3/4/2/134266111/3501439.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387567/normal_5f8e5abbc961e.pdfIn PDF document text
    • https://lisiladojorinin.weebly.com/uploads/1/3/0/8/130874519/remuf-nexorer-bekawod.pdfIn PDF document text
    • https://lepujipalojim.weebly.com/uploads/1/3/4/5/134599636/8e4092e55.pdfIn PDF document text
    • https://jarapitoxedomel.weebly.com/uploads/1/3/1/4/131437170/vodupuvij-poraxesi.pdfIn PDF document text
    • https://femitinekabel.weebly.com/uploads/1/3/1/4/131437683/koduka-manunadiwebawof.pdfIn PDF document text
    • https://bavejojonosepes.weebly.com/uploads/1/3/1/3/131380601/rabaro.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dumupa/fikusokugizenoz.pdfIn PDF document text
    • https://lodoxepal.files.wordpress.com/2020/11/vibinofa.pdfIn PDF document text
    • https://fizafadolozu.files.wordpress.com/2020/11/31713389540.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuzo/cell_organelle_puzzle_worksheet.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000846f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x846F 5092 bytes
SHA-256: 2afee028f8c0466b19f4f8dd5864b162baca9a42178d972562b7ed887f53808b
font_01_sfnt_off00009597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9597 10964 bytes
SHA-256: 59d7750e819da00d645abca84206b05a640b015c87070a4f703b5e239ec17f33

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