Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf8ae0cb52ecfe9c…

MALICIOUS

PDF

35.9 KB Created: 2020-08-19 12:27:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 33854990c48b37b29345d75733f10828 SHA-1: ef09181c7e2d1c123dc3a05e6446460f67d0773d SHA-256: bf8ae0cb52ecfe9c9d2f786a717a4493ba6e1ed2305813e721a0ad55c3e575fc
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is likely the primary malicious payload delivery mechanism. The document body contains garbled text along with the malicious URL and several benign-looking PDF links, further supporting the lure. No scripts were extracted from this sample.

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=toadies+answers+crossword+clue
    • http://files.shannonsarmy.com/uploads/1/3/0/9/130969717/pikisilixo_fisazatoputosad_mazixaz.pdf
    • http://betesa.mathteachercafe.com/uploads/1/3/0/7/130739415/jezonejegegubo.pdf
    • http://bubolarow.purplebookcart.com/uploads/1/3/1/8/131871721/7187552.pdf
    • http://remazelef.bearbugmedia.com/uploads/1/3/2/7/132712207/lilogiz.pdf
    • http://files.provenpurpose.net/uploads/1/3/0/7/130775033/xanaf-xotovelataguji.pdf
    • https://cdn.shopify.com/s/files/1/0431/4162/8072/files/bodukavogiwiletuvajovido.pdf
    • https://cdn.shopify.com/s/files/1/0431/0351/8882/files/santa_biblia_reina_valera_1960_descargar_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0432/0280/5921/files/site_catchment_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0431/3969/4741/files/igo_maps_2017_north_america.pdf
    • https://cdn.shopify.com/s/files/1/0439/6072/9758/files/achievement_motivation_and_academic_performance.pdf
    • https://cdn.shopify.com/s/files/1/0434/0878/5562/files/14268970259.pdf
    • https://cdn.shopify.com/s/files/1/0429/9853/0201/files/kuzinuwun.pdf
    • https://cdn.shopify.com/s/files/1/0431/4228/3432/files/solution_elementary_book.pdf
    • https://cdn.shopify.com/s/files/1/0440/1568/1701/files/barinivusokuninanoxuku.pdf
    • https://cdn.shopify.com/s/files/1/0427/5961/8716/files/44283248525.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4889/files/97867595100.pdf
    • https://cdn.shopify.com/s/files/1/0440/0673/6037/files/74044714588.pdf
    • https://cdn.shopify.com/s/files/1/0432/1309/5067/files/pujalobarizam.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_off00004f8a.bin
428cebb1412e8ce728fbac9166e5e6f4c913e457e0521b434da7b2acae17dd2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F8A 4972 bytes
font_01_sfnt_off0000608b.bin
0cbc1a52da78db07624bd540ac3a5bcd57b49a0fbf36c564302073dd09609c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x608B 10036 bytes

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