Malicious PDF — malware analysis report

Static analysis result for SHA-256 b619e10637c0ebb9…

MALICIOUS

PDF

42.6 KB Created: 2020-08-19 20:39:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e937597f6b81ed81d226447dcfbf7062 SHA-1: cba4917fae94f93bf33dcc7edcc16761eec80995 SHA-256: b619e10637c0ebb941ab26fb5193c70037dc8b3dca1d526d0b276d12a8721d8a
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.ru/pify?keyword=mcdougal+littell+geometry+answers+page+399'. This indicates the document is designed to redirect users to malicious infrastructure. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDFs, likely for SEO manipulation or to host further malicious content. The ML classifier strongly supports the malicious verdict.

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=mcdougal+littell+geometry+answers+page+399
    • http://files.heartcentredhealing.org/uploads/1/3/1/1/131164012/944e5.pdf
    • http://kagawino.advantagetraininggroup.com/uploads/1/3/1/1/131164250/varolofotozodut_lutalak_kumaxutapej.pdf
    • http://files.indigoeventservices.com/uploads/1/3/0/7/130776123/39abac.pdf
    • http://xisab.abullfrogstudio.com/uploads/1/3/2/3/132303382/pegidobu.pdf
    • http://files.reddoorgallerywahpeton.com/uploads/1/3/2/3/132303261/xukepunej-fufixin-rujavatem-rotekerav.pdf
    • https://cdn.shopify.com/s/files/1/0435/8481/5259/files/sopazubodi.pdf
    • https://cdn.shopify.com/s/files/1/0430/9604/7783/files/zufiwodofoza.pdf
    • https://cdn.shopify.com/s/files/1/0437/8922/2045/files/back-_ups_pro_550_manual.pdf
    • https://cdn.shopify.com/s/files/1/0438/1373/2512/files/95468727239.pdf
    • https://cdn.shopify.com/s/files/1/0444/2878/7878/files/99323160974.pdf
    • https://cdn.shopify.com/s/files/1/0428/4301/3287/files/wopujurewevo.pdf
    • https://cdn.shopify.com/s/files/1/0439/2163/7544/files/android_led_detroit_become_human_cosplay.pdf
    • https://cdn.shopify.com/s/files/1/0434/7772/9432/files/rem_vs_em.pdf
    • https://cdn.shopify.com/s/files/1/0429/2512/9894/files/62055519655.pdf
    • https://cdn.shopify.com/s/files/1/0430/7278/2489/files/differential_calculus_all_formula.pdf
    • https://cdn.shopify.com/s/files/1/0434/5744/6038/files/netebonab.pdf
    • https://cdn.shopify.com/s/files/1/0436/0205/1229/files/83206200483.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_off00005929.bin
5d912492e8baabd710ce64a44bb20d012b49273c4b11900e783abe197241c388		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5929 5912 bytes
font_01_sfnt_off00006d45.bin
28cfe5ba23cc4a5f7aaae4de3acf134eb25a0086d5e233703f76c7b79a003f10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D45 14488 bytes

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