Malicious PDF — malware analysis report

Static analysis result for SHA-256 6181ed90537d2d98…

MALICIOUS

PDF

47.0 KB Created: 2020-08-12 22:44:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c889a85db4c1cc0703285b0359df3fb1 SHA-1: 013331cc5407e4a3eaeef69bfab9d62bab3bb606 SHA-256: 6181ed90537d2d982b8d6223e782626c9baf9400043474b1360d3cd8ff8a6685
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.com, which is designed to obscure the final destination. The document also hosts a large number of external PDF links, suggesting a link farm for SEO manipulation or to distribute further malicious content. The ML classifier strongly indicated maliciousness, supporting the presence of these malicious indicators.

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=portugu%25C3%25AAs+para+concursos+pdf
    • http://files.pacificstudiodance.com/uploads/1/3/1/8/131859993/6666536.pdf
    • http://files.dahliaburroughs.com/uploads/1/3/1/4/131437683/pulizobemukefiw.pdf
    • http://files.pbsplatbrunei.com/uploads/1/3/1/4/131437891/libun.pdf
    • http://files.stonebrakerart.com/uploads/1/3/1/8/131871416/vugudarajidijib-volowar-pasofi-nitenew.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/7166/7352/files/5674466864.pdf
    • https://cdn.shopify.com/s/files/1/0432/4048/9122/files/zozijowidejuliruwenezura.pdf
    • https://cdn.shopify.com/s/files/1/0448/4923/4081/files/how_to_make_size_smaller_illustrator.pdf
    • https://cdn.shopify.com/s/files/1/0431/6971/0242/files/jewasuzomoposutezakaj.pdf
    • https://cdn.shopify.com/s/files/1/0431/5004/9448/files/8869551446.pdf
    • https://cdn.shopify.com/s/files/1/0435/1537/9880/files/banking_service_chronicle_june_2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/4071/8496/files/groin_strain_rehabilitation.pdf
    • https://cdn.shopify.com/s/files/1/0436/9698/0136/files/kanawaxuvidami.pdf
    • https://cdn.shopify.com/s/files/1/0439/5335/6955/files/vujosetalejusorow.pdf
    • https://cdn.shopify.com/s/files/1/0431/3972/7509/files/anarchy_online_reddit.pdf
    • https://cdn.shopify.com/s/files/1/0437/2096/6293/files/ramisafajejifotaw.pdf
    • https://cdn.shopify.com/s/files/1/0429/6278/0311/files/34062650154.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_off00007445.bin
9bcd8ec8c013d208c3d4855b88c6c5d3ee61a09a298d7f221150bc0efa83ea44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7445 5440 bytes
font_01_sfnt_off00008697.bin
ccb9b86fcd92a96d467487bf01d9bf85f0e61fffde3338ba182aad4f0ddf7ccb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8697 12668 bytes

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