Malicious PDF — malware analysis report

Static analysis result for SHA-256 865dd9a6ebab21b3…

MALICIOUS

PDF

45.6 KB Created: 2020-08-25 11:19:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a155d0f66a99130b9f618990aaa1f3e0 SHA-1: 2e988d6d2e3a18d796c987ad162823c4ce0d9fd0 SHA-256: 865dd9a6ebab21b3c912faaed804714f34a569b1fee8f81202aef1cf0cb05996
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to a redirector service (ttraff.com) and a large number of other PDFs, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly indicated maliciousness. The primary malicious IOC is the redirector URL, which likely leads to a phishing or malware download page.

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=cadillac+srx+2007+manual
    • http://fijen.lifeafternarc.com/uploads/1/3/0/9/130968979/2097f9af.pdf
    • http://files.gardenspotrentals.net/uploads/1/3/2/6/132681938/finefenusavat.pdf
    • http://files.backcountrywinery.com/uploads/1/3/0/7/130775062/soruwasam-pagedevokuwo-bokugiratasob-mowelabu.pdf
    • http://metigikiw.adventuresatyourdoorstep.com/uploads/1/3/0/7/130740572/9585232.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0429/2149/2643/files/negative_adjective_prefixes_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0438/1789/4050/files/logakiz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9658/8967/files/jufotesolajifop.pdf
    • https://cdn.shopify.com/s/files/1/0433/6159/9656/files/41834395972.pdf
    • https://cdn.shopify.com/s/files/1/0436/4481/3470/files/45385173698.pdf
    • https://cdn.shopify.com/s/files/1/0434/3876/8294/files/51057585004.pdf
    • https://cdn.shopify.com/s/files/1/0434/5207/2086/files/36990719879.pdf
    • https://cdn.shopify.com/s/files/1/0430/6858/8194/files/kebowo.pdf
    • https://cdn.shopify.com/s/files/1/0428/7745/2454/files/dikavepulaza.pdf
    • https://cdn.shopify.com/s/files/1/0432/6175/5560/files/61789854316.pdf
    • https://cdn.shopify.com/s/files/1/0438/0193/6033/files/nikavazudidukutemarul.pdf
    • https://cdn.shopify.com/s/files/1/0429/9515/5105/files/advocare_24_day_challenge_journal.pdf
    • https://cdn.shopify.com/s/files/1/0438/0462/3010/files/kajegidusumo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067a8.bin
7249d10ce1e73f45d45a9cb998caa9940c32d6f48c34db15f4027e7a4e97463e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67A8 5104 bytes
font_01_sfnt_off000078d7.bin
331510d1fa2a815535edc435b12f9f94fa9b7b3517592616efc3a7ee7cf0ac27		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78D7 10192 bytes
font_02_sfnt_off00009bab.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BAB 4324 bytes

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