Malicious PDF — malware analysis report

Static analysis result for SHA-256 89fff258a36bb617…

MALICIOUS

PDF

45.7 KB Created: 2020-08-14 23:28:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d2d479aba46d335b95f8baaa070aaae SHA-1: 9248385777d9d49a57ed36809cdcb9cc1dd3760f SHA-256: 89fff258a36bb61752c83573af3f3455ab561fca3db23060b4ad2ce5ac992c29
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.cc', which is associated with malicious activity. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, many hosted on Shopify. The document body, though heavily obfuscated, contains the same malicious URL and several other URLs, some of which are hosted on Shopify. The ML classifier also strongly indicated maliciousness.

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/wb?keyword=narrative%20essay%20book%20pdf
    • http://files.nicole-phillips.com/uploads/1/3/1/0/131071067/nixagarelitibab_lezikewaze_duwajoxo_nesevonejemax.pdf
    • http://files.maximsdogue.com/uploads/1/3/1/8/131856186/menodonu.pdf
    • http://fezujat.howwecomeapart.com/uploads/1/3/1/4/131438137/bolelarolagiz-dopoj-pezusus-tavoro.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/60801944673.pdf
    • https://cdn.shopify.com/s/files/1/0428/6152/7206/files/warasemajaguzewupil.pdf
    • https://cdn.shopify.com/s/files/1/0429/8126/1466/files/juzaxepebutuxadatal.pdf
    • https://cdn.shopify.com/s/files/1/0439/1328/1688/files/nunuk.pdf
    • https://cdn.shopify.com/s/files/1/0431/5129/4628/files/6491897323.pdf
    • https://cdn.shopify.com/s/files/1/0429/2280/3366/files/janokazeliga.pdf
    • https://cdn.shopify.com/s/files/1/0433/6330/3575/files/fijafapilazo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mapitawaluzosamorexub.pdf
    • https://cdn.shopify.com/s/files/1/0434/2788/9303/files/tcc_auditoria_externa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0219/1269/files/72074528345.pdf
    • https://cdn.shopify.com/s/files/1/0429/6248/5407/files/ios_13_beta_ipsw_windows.pdf
    • https://cdn.shopify.com/s/files/1/0433/0710/6462/files/sisudewa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vevisip.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006590.bin
5d282612d6e5159806f54711bc1f0662bbfb42d72d2569b3df377bf8aef7f052		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6590 5020 bytes
font_01_sfnt_off000076c6.bin
15b19eb4c585f8dbe55c28d298454414fc8d5fa23444ca14e2570c840962e91a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76C6 10924 bytes
font_02_sfnt_off00009a36.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A36 4324 bytes

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