Malicious PDF — malware analysis report

Static analysis result for SHA-256 a94be6a978da7530…

MALICIOUS

PDF

41.4 KB Created: 2020-09-03 11:29:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2cfbeba54a03ac0f454719e9f2625d7e SHA-1: 2427f643af90c7e0c4a00562cdcd332f21c448a0 SHA-256: a94be6a978da7530c3914b35747186f4174c0668caf47c28beeac835282ba888
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link, `https://ttraff.link/wix?keyword=ccleaner+portable+free++windows+8`, is designed to impersonate a search result for software, likely to trick users into downloading malicious files or visiting phishing sites. The presence of a large number of embedded links, many pointing to benign Shopify URLs, suggests a link farm or SEO poisoning tactic to improve search engine ranking for malicious content.

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.link/wix?keyword=ccleaner+portable+free++windows+8
    • https://cdn.shopify.com/s/files/1/0431/1669/1612/files/advanced_engineering_mathematics_6th_edition_zill.pdf
    • https://cdn.shopify.com/s/files/1/0438/5210/3842/files/26690834403.pdf
    • https://cdn.shopify.com/s/files/1/0431/4379/0760/files/36736443580.pdf
    • https://cdn.shopify.com/s/files/1/0431/1446/3394/files/mejimevazufogatoginexeru.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/98690712505.pdf
    • https://cdn.shopify.com/s/files/1/0434/3853/8908/files/berkshire_blanket_authentic_serasoft_sheet_set.pdf
    • https://cdn.shopify.com/s/files/1/0435/2439/1067/files/bufegiritekularivomo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6377/9221/files/berichtsheft_galabau.pdf
    • https://cdn.shopify.com/s/files/1/0440/6178/6262/files/jazz_blues_scales.pdf
    • https://cdn.shopify.com/s/files/1/0434/5721/6678/files/javascript_caesar_cipher.pdf
    • https://cdn.shopify.com/s/files/1/0430/2969/2577/files/kidubowufewuwolatukot.pdf
    • https://cdn.shopify.com/s/files/1/0427/9074/8316/files/37929647566.pdf
    • https://cdn.shopify.com/s/files/1/0465/1109/5958/files/41023699902.pdf
    • https://cdn.shopify.com/s/files/1/0429/6772/8279/files/91820565188.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_off00006124.bin
53ad985e641d0f18bfd5993a82e0bed8d326d931934a91c0c0a4204983e8c4f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x6124 5480 bytes
font_01_sfnt_off000073dd.bin
9bab24396faee75b357e15bac9d1a9c44b7260ac19cc41238ec0ca9e9531e28a
pdf-font-stream PDF embedded font (sfnt) at offset 0x73DD 10944 bytes