Malicious PDF — malware analysis report

Static analysis result for SHA-256 784de6ea375c48bc…

MALICIOUS

PDF

34.0 KB Created: 2020-08-18 14:27:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4c94121275896b6d921bacf0ae94c9f7 SHA-1: 1fa9bf7edd0475062094e379a43b79105df34b9a SHA-256: 784de6ea375c48bcd20fd561faddc7fcc3d5e8ca8232752e39c346d20e3343c6
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a manual title and URLs, suggesting a lure. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm indicates an attempt to distribute content or redirect users to malicious sites.

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=cateye+padrone+manual
    • http://vogapisep.blossomingbelliesbirth.com/uploads/1/3/0/8/130874431/5018363.pdf
    • http://files.brooksidechiropracticcare.com/uploads/1/3/1/4/131438874/1314895.pdf
    • http://files.ebenezermethodist.org/uploads/1/3/1/6/131637853/jisosusuxiwe.pdf
    • http://files.mbaker-retail.com/uploads/1/3/0/8/130813400/bisesuf-puleperul-gewugisesetiz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/5346/6271/files/pujafimibopeduz.pdf
    • https://cdn.shopify.com/s/files/1/0432/7977/7945/files/archlinux_installation_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/3058/5250/files/xuxejawa.pdf
    • https://cdn.shopify.com/s/files/1/0428/8105/6931/files/athanasius_on_the_incarnation_summary.pdf
    • https://cdn.shopify.com/s/files/1/0434/2480/9116/files/company_introduction_email_to_client.pdf
    • https://cdn.shopify.com/s/files/1/0431/5978/1538/files/va_form_21_530.pdf
    • https://cdn.shopify.com/s/files/1/0438/2218/6656/files/spectroscopy_application.pdf
    • https://cdn.shopify.com/s/files/1/0441/4255/9384/files/driving_test_practical_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0437/5881/3341/files/96036926633.pdf
    • https://cdn.shopify.com/s/files/1/0436/9743/8875/files/wafixoboku.pdf
    • https://cdn.shopify.com/s/files/1/0430/5652/9565/files/techno_pneumatic_cylinder_catalog.pdf
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/android_studio_in_mac.pdf
    • https://cdn.shopify.com/s/files/1/0429/3849/9235/files/tawobapuvo.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000048ce.bin
f12a22ebd74aaaef382f3d244c378cacf6b7721d85377b6bca41cf9bcd465ec2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x48CE 4936 bytes
font_01_sfnt_off00005981.bin
40a1d0f73bfb712970bf1c31d6684522b21b8cf165660061bda5c3ea32ca6fad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5981 10056 bytes

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