Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f9dfc463487c646…

MALICIOUS

PDF

41.7 KB Created: 2020-08-25 15:19:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 531895ca10029cf039c0b2e579961590 SHA-1: 793c3a80cfb534ead52a51f04a78c4b74777aea9 SHA-256: 0f9dfc463487c6461391eb09f017deae052b46e9583d3f7d3c6b34ca2f60cb0e
162 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including a critical finding for a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that mirrors the malicious redirector. The presence of numerous external links, many pointing to Shopify domains, suggests a link farm or SEO manipulation tactic to obscure the true malicious destination.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.com/pify?keyword=go+math+grade+6+printable+worksheets
    • http://denupob.davidstraange.com/uploads/1/3/2/7/132740930/3978507.pdf
    • http://fofojagav.stjohnsgolfcourse.com/uploads/1/3/1/4/131453574/sopevo.pdf
    • http://xebebifag.hockeyaustralia.net/uploads/1/3/0/7/130775797/rivakipezatifesolu.pdf
    • http://files.vaniteevogue.com/uploads/1/3/0/7/130775331/1834747.pdf
    • http://files.pansqip.org/uploads/1/3/1/3/131383977/ca60719fa3589.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/6027/8949/files/common_email_attachment_format.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fedixudarat.pdf
    • https://cdn.shopify.com/s/files/1/0447/9614/9921/files/thalapakattu_chicken_biryani_recipe_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0432/5654/5433/files/arduino_uno_r3_board.pdf
    • https://cdn.shopify.com/s/files/1/0431/2216/3876/files/50254234310.pdf
    • https://cdn.shopify.com/s/files/1/0433/3410/7286/files/sitekuzekamizitonepap.pdf
    • https://cdn.shopify.com/s/files/1/0459/8952/7714/files/bajirao_mastani_telugu_songs.pdf
    • https://cdn.shopify.com/s/files/1/0438/4984/2850/files/radibovatemezosekezor.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/33374625424.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_off00006317.bin
65046a6e3de7100ab885aeb0a05ac486bd9ad2a762b40c4b38933e15eecb62b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6317 5852 bytes
font_01_sfnt_off000076e6.bin
f0f99ffbd3c26aac32695ac986ef2d4d8d5afe233abb08543aaf2a631b37e94e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76E6 10120 bytes

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