Malicious PDF — malware analysis report

Static analysis result for SHA-256 29fa309c5c0f8c75…

MALICIOUS

PDF

45.3 KB Created: 2020-08-09 19:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12436af2ec00ed96ef44706d7096a624 SHA-1: ea4de4df97ca86c6dc581edaf519e0b0a048f8a5 SHA-256: 29fa309c5c0f8c75118308b01bf49e5910b658a5759868f6c9e13e0a2ffb4654
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a malicious redirector link pointing to 'ttraff.com', which is flagged as malicious. The document body, though heavily obfuscated, contains this URL and appears to be a lure for a 'PDF markup app'. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm for SEO poisoning or traffic generation. The ML classifier strongly indicates 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.com/pify?keyword=pdf+markup+app+windows+10
    • http://xaxovenud.bridgewatercompositesquadron-civilairpatrol.org/uploads/1/3/2/6/132680813/9317e57ccacd.pdf
    • http://bexaxi.courtrobertarts.co.uk/uploads/1/3/0/8/130874431/zibomaxem_nirujamegiz_zabopolutudu.pdf
    • http://puluripo.sharingfamilymemories.org/uploads/1/3/1/4/131406749/vebapoxobizu.pdf
    • http://files.nctroop10.com/uploads/1/3/1/4/131407424/411551.pdf
    • https://cdn.shopify.com/s/files/1/0433/4636/2527/files/64679678574.pdf
    • https://cdn.shopify.com/s/files/1/0431/2793/1034/files/kelavesokobebosuposija.pdf
    • https://cdn.shopify.com/s/files/1/0437/1942/6197/files/children_handwriting_font.pdf
    • https://cdn.shopify.com/s/files/1/0431/7901/6360/files/daxojev.pdf
    • https://cdn.shopify.com/s/files/1/0438/3604/7522/files/school_of_thoughts_in_psychology_behaviorism.pdf
    • https://cdn.shopify.com/s/files/1/0430/6285/3794/files/vipawazunejigoxawejike.pdf
    • https://cdn.shopify.com/s/files/1/0435/8383/2227/files/hoover_steamvac_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/8937/1044/files/52556651712.pdf
    • https://cdn.shopify.com/s/files/1/0433/6202/5624/files/stew_smith_12_weeks_to_buds.pdf
    • https://cdn.shopify.com/s/files/1/0429/9204/2137/files/list_of_amendments_to_the_united_states_constitution.pdf
    • https://cdn.shopify.com/s/files/1/0431/0971/2021/files/forgotten_realms_interactive_atlas_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/0108/5082/files/31748507968.pdf
    • https://cdn.shopify.com/s/files/1/0433/7650/9080/files/54334067721.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_off00006678.bin
484cc330a9b20e938e6681e07d2509e2fa61fd5b345e4b18d7c521755a4969be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6678 5192 bytes
font_01_sfnt_off00007805.bin
3e884866e89a46573753023813b0b834f31a4bceca814d0c7ac605787432b2de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7805 9860 bytes
font_02_sfnt_off000099b0.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99B0 4324 bytes

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