Malicious PDF — malware analysis report

Static analysis result for SHA-256 65921f1063f67936…

MALICIOUS

PDF

42.3 KB Created: 2020-08-12 21:08:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e66fe8b311fa143324da385f170fde1e SHA-1: 24768b4d7a0cf84a9982e4b0d98c81c26a290071 SHA-256: 65921f1063f67936c26a6837c6348644fb244e386b5a141c3b7576d511f59b76
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to Shopify domains hosting other PDFs, but one critical link directs to a known malicious redirector. This suggests a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier strongly flagged this PDF as malicious, reinforcing the assessment that the embedded links are intended to lead users to harmful 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.com/pify?keyword=political+effects+of+colonialism+in+africa+pdf
    • http://files.jmgolfcoaching.com/uploads/1/3/0/7/130739974/1196662.pdf
    • http://files.reynoldseducationassociation.org/uploads/1/3/1/4/131483148/kusunopu.pdf
    • http://wejebere.juliahobdayphotography.com/uploads/1/3/0/7/130775195/8387d1c1f5e0.pdf
    • http://files.ibew23.org/uploads/1/3/0/7/130775952/491866.pdf
    • http://files.paulmcphater.com/uploads/1/3/2/7/132741169/wilanaxegugopek-zakapisi-wowon.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/60801944673.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sarozasupevukofapunaxovu.pdf
    • https://cdn.shopify.com/s/files/1/0432/1358/6596/files/retrieve_blob_from_mysql_php.pdf
    • https://cdn.shopify.com/s/files/1/0427/9926/8003/files/83794976919.pdf
    • https://cdn.shopify.com/s/files/1/0432/7460/0598/files/marketing_e_arquetipos_helio_couto.pdf
    • https://cdn.shopify.com/s/files/1/0431/1485/6610/files/puruzisibegezamiwubod.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gejazopemovaro.pdf
    • https://cdn.shopify.com/s/files/1/0438/2933/0082/files/lalozilajokusoropivelu.pdf
    • https://cdn.shopify.com/s/files/1/0428/8489/0790/files/myth_and_meaning_cracking_the_code_of_culture_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0427/9291/1007/files/tebifativinexe.pdf
    • https://cdn.shopify.com/s/files/1/0429/8362/0757/files/xuduragagurazolokunoso.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_off0000699a.bin
4e41c8287f5568edc742b96bfa397cc5b93919ff8b633d273e4c08e4a862cad9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x699A 5300 bytes
font_01_sfnt_off00007b7c.bin
c772c5de39dbefea814090c60ebf1111e575eb27667ad19c065a93113edd035d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B7C 9652 bytes

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