Malicious PDF — malware analysis report

Static analysis result for SHA-256 21bbad1c0f85601a…

MALICIOUS

PDF

41.1 KB Created: 2020-08-24 16:43:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc0a3452702bad078d517175a0f34df6 SHA-1: 73be0d4b1d5d0404b217f0a855669be7c1d20747 SHA-256: 21bbad1c0f85601adbf761fe91301550a1cf114c5230bdc80881c56dafa2c2ea
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation or traffic redirection. One critical heuristic identified a direct link to known malicious redirector infrastructure at `https://ttraff.cc/pify?keyword=cashew+chicken+sheet+pan+recipe`. The document body, though heavily obfuscated, contains this same URL, indicating the primary intent is to redirect users to potentially harmful 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.cc/pify?keyword=cashew+chicken+sheet+pan+recipe
    • http://files.billsofer.com/uploads/1/3/2/6/132695646/vugejedonufago.pdf
    • http://files.bethelmbchurch.org/uploads/1/3/1/0/131070846/zududuwi_ziditavatuge.pdf
    • https://cdn.shopify.com/s/files/1/0430/4466/7553/files/paditiritobiwukuxog.pdf
    • https://cdn.shopify.com/s/files/1/0431/9097/6673/files/xuxisesakelunoxipofagalip.pdf
    • https://cdn.shopify.com/s/files/1/0431/6033/8594/files/kuvoropokifamelubaxarew.pdf
    • https://cdn.shopify.com/s/files/1/0432/3803/1518/files/46157401963.pdf
    • https://cdn.shopify.com/s/files/1/0432/0867/1394/files/sistema_capitalista_caracteristicas.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/benubojebexoreloruva.pdf
    • https://cdn.shopify.com/s/files/1/0432/8020/3944/files/speaking_skills_in_english_language_teaching.pdf
    • https://cdn.shopify.com/s/files/1/0438/3028/0352/files/tesasuruvalaf.pdf
    • https://cdn.shopify.com/s/files/1/0443/2373/3660/files/gimifisuxidufowuxupuj.pdf
    • https://cdn.shopify.com/s/files/1/0438/4253/5574/files/didezoz.pdf
    • https://cdn.shopify.com/s/files/1/0432/4448/6811/files/guravekizatuzumonuw.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mupesoxozuwimufuvijolus.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_off0000629b.bin
c626d367c576dc9a0a073694c8716ddf315db3fb3b1d5478b485f2cb1361f83f
pdf-font-stream PDF embedded font (sfnt) at offset 0x629B 5048 bytes
font_01_sfnt_off000073cc.bin
c375b078dd9e732715af8b3d5d5a659a5d3be7b34f2201917fd6188d965a7843
pdf-font-stream PDF embedded font (sfnt) at offset 0x73CC 10532 bytes