Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cbf4d6a6c1937d9…

MALICIOUS

PDF

44.9 KB Created: 2020-08-02 19:58:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15225c21e6b95e43b7a3d20fa3e5257c SHA-1: fc8cb0f71059987dfc06c2fa482ade0481ba603d SHA-256: 0cbf4d6a6c1937d9385be39f19c90a734418ad5abf8707b5c01ca823542cdc71
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 external PDFs hosted on Shopify and other domains, suggesting a link farm or SEO poisoning attempt. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=the+divide+2011'. The document body, though heavily obfuscated, contains references to 'The divide 2011' and the URLs, indicating a lure to potentially malicious content. The ML classifier also strongly flagged this PDF as malicious.

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.cc/pify?keyword=the+divide+2011
    • http://files.akillerstory.com/uploads/1/3/1/3/131397987/2924895.pdf
    • http://files.maeflowerfarms.com/uploads/1/3/0/7/130738801/lekegezekujew_sufakerijijok.pdf
    • http://files.karenflanneryphotography.com/uploads/1/3/1/4/131482819/vinikokijuwekiwos.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/7826/2689/files/bikofuzokexakubadepokon.pdf
    • https://cdn.shopify.com/s/files/1/0432/5107/3174/files/81142238072.pdf
    • https://cdn.shopify.com/s/files/1/0428/2328/6940/files/jofasofus.pdf
    • https://cdn.shopify.com/s/files/1/0429/7441/2949/files/vejowuxavidu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5712/7336/files/vefiwaxoxo.pdf
    • https://cdn.shopify.com/s/files/1/0429/9040/3737/files/93920289449.pdf
    • https://cdn.shopify.com/s/files/1/0430/9480/2581/files/paxobisepinokome.pdf
    • https://cdn.shopify.com/s/files/1/0427/7485/5846/files/21253770276.pdf
    • https://cdn.shopify.com/s/files/1/0428/9249/2963/files/dudejabowemidozosoj.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/giratajolexodomofavewolov.pdf
    • https://cdn.shopify.com/s/files/1/0438/2110/5309/files/83614290984.pdf
    • https://cdn.shopify.com/s/files/1/0430/2651/4077/files/ropaluxenu.pdf
    • https://cdn.shopify.com/s/files/1/0434/2608/7064/files/fuzalaw.pdf
    • https://cdn.shopify.com/s/files/1/0430/7124/2391/files/vowesu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007129.bin
bd546fa189a36a46225cb226fa36c65c380aa9bf13d3b6452fa396f0d6d648e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7129 4732 bytes
font_01_sfnt_off0000814f.bin
15106426edc1569059eb2cf04b651027c1e40e8c3be70a3d86d0ac606e8b5dca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x814F 11124 bytes

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