Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f823dd4344c31eb…

MALICIOUS

PDF

47.5 KB Created: 2020-08-04 23:05:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c41ac3d08ad6d630a0fe1f4d42320143 SHA-1: 5fa28118da8bf9392f86d010f0704786d9842eaa SHA-256: 6f823dd4344c31ebc8909c426333d6c3ac2d476bab8f321dd611d467c29cfdb5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a redirector service (ttraff.ru) which is flagged as malicious. The document body, though heavily obfuscated, contains the same malicious URL, suggesting an attempt to trick users into downloading software. The presence of numerous benign Shopify links is likely part of a SEO spam campaign to increase the PDF's visibility, with the malicious link embedded within.

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=adobe+pdf+reader+for+windows+7+64+bit+free+download
    • http://files.angesplace.com/uploads/1/3/0/7/130739814/kutexuwizuf_sevote_fofuwutuzola_nomafu.pdf
    • http://files.lifetransformationgroup.com/uploads/1/3/1/8/131857114/perenun.pdf
    • http://files.chrisavisartist.com/uploads/1/3/0/7/130740231/6139485.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0427/9628/6111/files/farelozamupedofi.pdf
    • https://cdn.shopify.com/s/files/1/0431/4421/6727/files/37620923890.pdf
    • https://cdn.shopify.com/s/files/1/0430/9480/2581/files/vunepev.pdf
    • https://cdn.shopify.com/s/files/1/0427/9861/2636/files/maxovugumapivirisovadeta.pdf
    • https://cdn.shopify.com/s/files/1/0427/7387/2807/files/84149054863.pdf
    • https://cdn.shopify.com/s/files/1/0436/5749/4686/files/convert_to_black_and_white.pdf
    • https://cdn.shopify.com/s/files/1/0431/4932/8533/files/58034990760.pdf
    • https://cdn.shopify.com/s/files/1/0436/6853/7497/files/27685544694.pdf
    • https://cdn.shopify.com/s/files/1/0440/6162/2437/files/90047239652.pdf
    • https://cdn.shopify.com/s/files/1/0430/9067/3813/files/57264305871.pdf
    • https://cdn.shopify.com/s/files/1/0431/5031/1579/files/fafapiwege.pdf
    • https://cdn.shopify.com/s/files/1/0432/8351/3494/files/narafob.pdf
    • https://cdn.shopify.com/s/files/1/0433/0697/5382/files/zewukofo.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_off00006e5e.bin
6508a88595521c0c897453d3e452d7e805643268dcf2fd0f5b627473db92318e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E5E 5368 bytes
font_01_sfnt_off000080ba.bin
6e3f38a68d3d4b85d00fa69a61dd659ba3dca55b24a714c796884c1cac9b120a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80BA 9808 bytes
font_02_sfnt_off0000a245.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA245 4324 bytes

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