Malicious PDF — malware analysis report

Static analysis result for SHA-256 f887c2c4ec2aa848…

MALICIOUS

PDF

40.9 KB Created: 2020-11-09 09:31:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 064ab997a27ec4298ae73627501f9748 SHA-1: 070e6aa8819e378a025891d6c2865877caedda65 SHA-256: f887c2c4ec2aa8488e72a2204adac651ed6e51cb339b76f25372674e9924c3a5
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a critical heuristic identifying it as a redirector link to malicious infrastructure and a link farm. The ML classifier strongly indicates maliciousness. While no scripts were extracted, the presence of many external links suggests an attempt to lure users to potentially harmful sites, likely for SEO spam or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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/aws?keyword=east+egg+vs+west+egg+essay In PDF document text
    • https://gowiwoniba.weebly.com/uploads/1/3/1/8/131857243/1865409.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371790/normal_5f8a867d1dda7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366036/normal_5f8726ab99250.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388041/normal_5fa8e7e515440.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372980/normal_5f8eeba63ee20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380392/normal_5f9107a7af6e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425009/normal_5fa831480d36f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393018/normal_5f95b398a15b2.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/bosilo_ginasesif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388819/normal_5f944c3d32c1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420910/normal_5f965cf1c32ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417806/normal_5fa2cd0368daf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373519/normal_5f9340cb11f16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426088/normal_5f98c7630f3ea.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000631e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x631E 4936 bytes
SHA-256: 60415749ae73c9c679f17fa06b4357a1cfc48e2a7b204e777c578123a0556992
font_01_sfnt_off0000741f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x741F 10228 bytes
SHA-256: b00bea9a7f777ca530410da01ae5b1a397e5bd1e64d289c42638145a38d02c5e

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