Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa66e090ce086bf3…

MALICIOUS

PDF

51.9 KB Created: 2020-08-09 04:18:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d54d3dd938ce25e88c732a6cf31cf25e SHA-1: 285aa4df5b35b58f1c1873036e0872c6d375345c SHA-256: fa66e090ce086bf3254230f21e84f3cf511e2329170dbc5435529ca688877433
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF file contains numerous embedded links, a significant portion of which point to a redirector service (ttraff.ru) that is known to host malicious content. The heuristic 'PDF_SEO_LINK_FARM' indicates a deliberate attempt to create a large number of SEO-optimized links, likely to obscure the malicious destination and improve search engine visibility. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the primary redirector URL and several Shopify-hosted URLs, suggesting a link farm strategy.

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=bossa+nova+guitarra+pdf
    • http://files.camdenvillepaddock.com/uploads/1/3/1/3/131383655/b022cee49594204.pdf
    • http://files.cleanteamprestwich.org/uploads/1/3/1/8/131871644/fezabon-vefija.pdf
    • http://files.jitsbottles.com/uploads/1/3/1/4/131411474/ab814b79dbcd284.pdf
    • https://cdn.shopify.com/s/files/1/0433/4161/1159/files/53516502435.pdf
    • https://cdn.shopify.com/s/files/1/0432/4697/7179/files/mejubepezozerikaka.pdf
    • https://cdn.shopify.com/s/files/1/0430/8585/6919/files/purabadorerowoso.pdf
    • https://cdn.shopify.com/s/files/1/0432/7522/3200/files/zugiwegowezudoketipev.pdf
    • https://cdn.shopify.com/s/files/1/0429/5576/7967/files/ganove.pdf
    • https://cdn.shopify.com/s/files/1/0429/9168/1699/files/tovimivizu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nedodakamilutejevojive.pdf
    • https://cdn.shopify.com/s/files/1/0427/9074/8316/files/vawalubutolovebubumagot.pdf
    • https://cdn.shopify.com/s/files/1/0436/1604/3168/files/circulatory_system_diseases_list.pdf
    • https://cdn.shopify.com/s/files/1/0430/0275/7281/files/20393251952.pdf
    • https://cdn.shopify.com/s/files/1/0432/0113/4747/files/nesol.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vatajimawi.pdf
    • https://cdn.shopify.com/s/files/1/0431/4077/6093/files/69253218926.pdf
    • https://cdn.shopify.com/s/files/1/0429/0795/9452/files/zorixesabudebu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007890.bin
0e011ebbe92e669721eac1701d5b2747aa17099f35f81de822c82e77b8855cdb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7890 5288 bytes
font_01_sfnt_off00008aaa.bin
870b55e5bd81cc26e860e69da354ba34947e189897bdea3dcbe13dca2731ff21		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AAA 9984 bytes
font_02_sfnt_off0000acfb.bin
c41fc46809d2260d2d1a821cef6bb00dae560fdbad380da94a93f29d012df54e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xACFB 16164 bytes

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