Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa5cdbfd58e1e839…

MALICIOUS

PDF

98.8 KB Created: 2020-10-31 05:31:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: d0d44374e355aaec86eb34eb5fc20d1f SHA-1: 2d167334a56eb3b511c1d40b74206d419c14ef88 SHA-256: aa5cdbfd58e1e83916321c881df9ece2ea707eed22d00a39f2e5867e0c81fa74
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of embedded links pointing to external PDF documents hosted on various domains, many of which appear to be disposable or associated with link farms. One URL, 'https://gettraff.ru/pify?keyword=collective+rule-based+ethics+corresponds+with', is identified as a malicious redirector. The ML classifier also flagged this PDF with high confidence. The primary function appears to be directing users to potentially malicious or SEO-manipulated content.

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://gettraff.ru/pify?keyword=collective+rule-based+ethics+corresponds+with In PDF document text
    • https://jomitapekox.weebly.com/uploads/1/3/4/3/134319499/miraforovew.pdfIn PDF document text
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/1000608.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376379/normal_5f8a21a661288.pdfIn PDF document text
    • https://bupiwuzisulim.weebly.com/uploads/1/3/0/8/130874125/532713.pdfIn PDF document text
    • https://fukobararusi.weebly.com/uploads/1/3/4/4/134404541/robibokefoxabafofad.pdfIn PDF document text
    • https://piziruzebizopu.weebly.com/uploads/1/3/4/3/134350425/suvuxupixekimuzule.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376856/normal_5f89e3c597bce.pdfIn PDF document text
    • https://vaxajiwozoli.weebly.com/uploads/1/3/1/6/131637631/9160067.pdfIn PDF document text
    • https://derodaju.weebly.com/uploads/1/3/1/6/131606282/winenokuxozuwod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/de098038-e5d8-45cd-9af7-855da9e4ecba/neruzejowufexipojofebixe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/3837/8650/files/descargar_juego_garena_free_fire_apk.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_off0001452e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1452E 5388 bytes
SHA-256: 4b064a46c4e04b10492a26b57fe91a89cb9c87aa16854d006813c8e2078b4d7f
font_01_sfnt_off00015786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15786 11428 bytes
SHA-256: 5bd7b73211c4f2e7e2ab8167ae3c7f58326dbe1987467a6e5d9624293d93627b

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