Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc4ec7bffb9572ef…

MALICIOUS

PDF

41.9 KB Created: 2020-08-07 03:47:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1139bf30222ae6fa721b230d6c754336 SHA-1: 66a4bdb5d45584d98a4d94f5f554f9343ed26fd4 SHA-256: bc4ec7bffb9572ef5917a64e49adc0dd2afb939eab77961b3298a37e03214088
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, disguised as a free workout plan. This indicates a phishing or social engineering attempt to lead the user to malicious infrastructure. The PDF also contains a large number of external links, many pointing to Shopify domains, suggesting a link farm or SEO poisoning tactic to increase visibility and traffic to the malicious redirector. No scripts were extracted, and the document body is heavily obfuscated.

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.com/pify?keyword=muscle+gain+workout+plan+pdf+free
    • http://files.alpineanimalhospital.us/uploads/1/3/0/9/130969652/a8c2e57e98b000.pdf
    • http://files.horsesbyelliehesse.com/uploads/1/3/0/9/130969386/pexuz.pdf
    • http://files.camera1.ca/uploads/1/3/1/3/131380413/pizixejawij.pdf
    • http://files.products.artmark.com/uploads/1/3/0/8/130814132/fixiwa.pdf
    • https://cdn.shopify.com/s/files/1/0447/8930/1409/files/vernacular_architecture_of_nepal.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1650/files/risururek.pdf
    • https://cdn.shopify.com/s/files/1/0443/0423/6700/files/william_gillock_piano.pdf
    • https://cdn.shopify.com/s/files/1/0435/6934/8763/files/78178113735.pdf
    • https://cdn.shopify.com/s/files/1/0440/1351/9006/files/kill_tmux_session.pdf
    • https://cdn.shopify.com/s/files/1/0439/1239/6968/files/15303427974.pdf
    • https://cdn.shopify.com/s/files/1/0427/9785/8972/files/9302435616.pdf
    • https://cdn.shopify.com/s/files/1/0433/1814/9285/files/29503238182.pdf
    • https://cdn.shopify.com/s/files/1/0429/3050/3843/files/everything_i_never_told_you_novel.pdf
    • https://cdn.shopify.com/s/files/1/0429/6949/7753/files/zolekejevozebaged.pdf
    • https://cdn.shopify.com/s/files/1/0428/6434/5255/files/rekobetowuviw.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_off000064ed.bin
9916d06c6c1c03cacad61feb9e07be504f85caea6dc246b78a4b3d6db4c9ebc4
pdf-font-stream PDF embedded font (sfnt) at offset 0x64ED 5484 bytes
font_01_sfnt_off000077cc.bin
edc280c0f8be709f760e71f5ab92e0eb138f25141f445a63765b19fedc562255
pdf-font-stream PDF embedded font (sfnt) at offset 0x77CC 10292 bytes