Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfc71426eb689432…

MALICIOUS

PDF

42.3 KB Created: 2020-08-11 04:43:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9c55f6cc4a0a294627199c1c86cfb8b SHA-1: 06666ee7451e36eee127186e21e226b794d7b98b SHA-256: bfc71426eb689432717f611fed1f820965d74d1749db2a511960511fdf59ec8c
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1059.001 Command and Scripting Interpreter: PowerShell

This PDF file contains a link to a known malicious redirector, ttraff.ru, which is likely used to obscure the final malicious destination. The document body, though heavily obfuscated, contains the URL and a plausible lure related to legal documents. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning attempt to drive traffic to malicious sites. No scripts were extracted, but the primary malicious behavior is the redirection via the embedded URL.

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.ru/pify?keyword=answer+to+complaint+california+pdf
    • http://files.balaregatta.com/uploads/1/3/0/7/130775364/9968695.pdf
    • http://files.stephaniegstark.com/uploads/1/3/0/8/130813859/9370823.pdf
    • http://files.cyber-sec.us/uploads/1/3/0/8/130814714/jekavow_lesaxujo.pdf
    • http://files.gaiteway.org/uploads/1/3/1/1/131164446/zopepabel.pdf
    • http://files.victorheritagesociety.com/uploads/1/3/0/8/130814169/mijudoseler-zorafuza-benudi-kuwuxo.pdf
    • https://cdn.shopify.com/s/files/1/0433/6667/8686/files/dojixojukesuwu.pdf
    • https://cdn.shopify.com/s/files/1/0450/9502/6840/files/roland_barthes_mythologies_english.pdf
    • https://cdn.shopify.com/s/files/1/0432/2705/4237/files/gowifabalevenun.pdf
    • https://cdn.shopify.com/s/files/1/0430/9444/2145/files/22436885104.pdf
    • https://cdn.shopify.com/s/files/1/0430/8179/3698/files/rogawski_calculus_for_ap_second_edition.pdf
    • https://cdn.shopify.com/s/files/1/0429/8624/2209/files/8301191272.pdf
    • https://cdn.shopify.com/s/files/1/0428/0185/6679/files/jofat.pdf
    • https://cdn.shopify.com/s/files/1/0428/0428/1511/files/kaviwodonat.pdf
    • https://cdn.shopify.com/s/files/1/0431/5850/3584/files/calcium_diet.pdf
    • https://cdn.shopify.com/s/files/1/0439/6626/7550/files/limp_bizkit_break_stuff.pdf
    • https://cdn.shopify.com/s/files/1/0454/0373/4184/files/alfuzosin_davis.pdf
    • https://cdn.shopify.com/s/files/1/0436/4809/0270/files/kigesolive.pdf
    • https://cdn.shopify.com/s/files/1/0429/2853/7753/files/31188525157.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000665a.bin
21fee96910bfaf31c2dd5966927624bd267216d2be83b85f239fecec83182f60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x665A 5384 bytes
font_01_sfnt_off00007895.bin
73c2447d224799c1688dfc17f35d41a137a09776c98f6e218638112d9cac5d9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7895 10364 bytes

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