Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aaee64844b354e8…

MALICIOUS

PDF

115.1 KB Created: 2020-08-19 19:23:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c74bd7936a7e10b0050995a91dae050 SHA-1: ff4341239c384c8d2e7b1ef86a1efe58eeea3733 SHA-256: 6aaee64844b354e8fc602ef10f5ce2725b84f1e136c706810e2e4983a8ea8692
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of embedded links, many pointing to Shopify domains, suggesting a link farm or SEO manipulation tactic. One of these links, 'https://ttraff.cc/pify?keyword=squat+form+checklist', is identified as a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The document body appears to be malformed or heavily obfuscated, but the presence of the malicious redirector URL is a high-confidence indicator of malicious intent.

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=squat+form+checklist
    • http://sutul.speakingofbirth.com/uploads/1/3/1/6/131637027/da3a0.pdf
    • http://files.fincast.com.au/uploads/1/3/1/6/131607158/napiwewatidoren_lonotafegigev.pdf
    • http://xinovab.tuxedowarehouse.net/uploads/1/3/1/0/131070458/woxelekituvumanofo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/7913659608.pdf
    • https://cdn.shopify.com/s/files/1/0437/2935/4906/files/pillars_of_eternity_druid.pdf
    • https://cdn.shopify.com/s/files/1/0440/3567/0166/files/87317028235.pdf
    • https://cdn.shopify.com/s/files/1/0434/0924/4316/files/zotavunitul.pdf
    • https://cdn.shopify.com/s/files/1/0434/3896/4903/files/difafegeborusiz.pdf
    • https://cdn.shopify.com/s/files/1/0430/1383/2857/files/wejiwitulobasavopibodob.pdf
    • https://cdn.shopify.com/s/files/1/0435/2478/4283/files/13604657325.pdf
    • https://cdn.shopify.com/s/files/1/0440/6562/0118/files/jaspersoft_studio_user_guide.pdf
    • https://cdn.shopify.com/s/files/1/0437/1451/1001/files/javascript_object_id.pdf
    • https://cdn.shopify.com/s/files/1/0428/9524/5475/files/45274125108.pdf
    • https://cdn.shopify.com/s/files/1/0427/9166/5830/files/ginunilelujozobotas.pdf
    • https://cdn.shopify.com/s/files/1/0429/9702/2879/files/kigosogifetokiziki.pdf
    • https://cdn.shopify.com/s/files/1/0431/5286/7494/files/wukojavudixe.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_off00018823.bin
30e479d88c4dc5f8c7456b169c0db24f7fba3af5066d8b8fe56646ab423e0a3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18823 5416 bytes
font_01_sfnt_off00019a6a.bin
902d017db96fd674c7b0fc4e901e10803b14fc9e46024dba7b1f3abe2d77802b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19A6A 10592 bytes

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