Malicious PDF — malware analysis report

Static analysis result for SHA-256 8686fdd485cdb948…

MALICIOUS

PDF

76.3 KB Created: 2020-08-06 18:25:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc46eff2af82ae146d601121b6b0ed19 SHA-1: eec6b0fb599e0e4bc10649990656b69d9664d671 SHA-256: 8686fdd485cdb94828b6c3f6827e20d8de195c57ee1d33c71121140dffcb22a9
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, with a critical heuristic indicating redirection to known malicious infrastructure. The ML classifier also flagged the document as malicious. While no scripts were explicitly extracted, the presence of numerous links suggests an attempt to lure users to malicious sites, potentially for phishing or malware distribution.

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=candelario+obeso+pdf
    • http://files.carolannliaros.com/uploads/1/3/1/4/131438464/5f6e1439dc949.pdf
    • http://files.nineacresfarm.com/uploads/1/3/0/8/130813357/6911875.pdf
    • http://files.namibiatourism.info/uploads/1/3/1/3/131380175/86d53c608.pdf
    • http://files.afkclothingcompany.com/uploads/1/3/1/3/131398419/8899016.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rerisorajomowuba.pdf
    • https://cdn.shopify.com/s/files/1/0439/3956/1630/files/27195517473.pdf
    • https://cdn.shopify.com/s/files/1/0438/2277/6480/files/55262704339.pdf
    • https://cdn.shopify.com/s/files/1/0430/4447/0933/files/lanigisusulasilifabosa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xekosipavejidowusa.pdf
    • https://cdn.shopify.com/s/files/1/0433/3685/9813/files/41645301690.pdf
    • https://cdn.shopify.com/s/files/1/0432/2269/6096/files/83062961688.pdf
    • https://cdn.shopify.com/s/files/1/0427/5381/8790/files/auralic_vega_g1.pdf
    • https://cdn.shopify.com/s/files/1/0429/4351/2732/files/l_alchimiste_arabe.pdf
    • https://cdn.shopify.com/s/files/1/0429/5468/6617/files/vibobowujizasidisapimizem.pdf
    • https://cdn.shopify.com/s/files/1/0438/7926/8520/files/destination_a1_a2.pdf
    • https://cdn.shopify.com/s/files/1/0433/3040/4506/files/suzixesijusavidonilisepip.pdf
    • https://cdn.shopify.com/s/files/1/0432/7217/5781/files/sifadegula.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_off0000ed24.bin
3167dab6f3af8c47812b988c9ef7c639faff0b1a71b0fbf96a8bc6ba221e1d3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED24 5080 bytes
font_01_sfnt_off0000fe6b.bin
6cab033e6a7873398696bf87549f992dac81d14e8ef8d9d853b2a10fe4827280		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6B 11044 bytes

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