Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b23b450d6f83af1…

MALICIOUS

PDF

42.2 KB Created: 2020-09-04 13:43:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9d0a49ff582d6d4d606ffc9003a54a74 SHA-1: dc113c2901fec338f02244bac0cff9529e8aef0d SHA-256: 0b23b450d6f83af1cd2f67a06c623475f5fe5f5961f17bdb06f55cf274298f40
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service known to host malicious content. The document body, though heavily obfuscated, contains a URL that matches the redirector. This suggests the PDF is part of a link farm or SEO poisoning campaign to drive traffic to malicious sites.

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://ttraff.club/pify?keyword=agar.+io+bots+android In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7133/9686/files/hdfc_life_insurance_plans.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3646/5559/files/sjogren_s_syndrome_review.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3583/6063/files/49926018113.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6341/0839/files/voladamege.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3525/5203/files/rizuzolekota.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6388/5472/files/76227542069.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4303/6053/files/88248123664.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3600/6810/files/73448346238.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8956/7650/files/95412896128.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7369/0017/files/14630252106.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_off00005f12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F12 5120 bytes
SHA-256: 2669b2447f72b6f655c1d8978f7419dd0f6d2da544f887ac12af714ca6b86ba6
font_01_sfnt_off0000708e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x708E 13764 bytes
SHA-256: 548fb2eddb7ab989fe8ce762e71877ef13c92110638021bf3a0d703adece7e0a

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