Malicious PDF — malware analysis report

Static analysis result for SHA-256 633437a74dfcb7b7…

MALICIOUS

PDF

43.6 KB Created: 2020-08-04 18:12:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27e37f88c83b0146e1b41f372f8faba8 SHA-1: bf5cb21df6c74a34a29a99abaaa373e06cd15751 SHA-256: 633437a74dfcb7b7b92f92707fd6cc15accae6248d0619838dd750e0768ae4d8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. This suggests the document is designed to lure users to malicious sites, likely as part of a phishing or scam campaign.

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=cambay+basin+pdf
    • http://files.dinahhaag.com/uploads/1/3/0/7/130775719/kisedipurugiv_kaxatebelemato.pdf
    • http://files.gettingtogethernow.com/uploads/1/3/1/4/131437172/suwelidawinu_kutaduvoxu_wefanimi_suxemalibujudam.pdf
    • http://files.ondaruokala.fi/uploads/1/3/1/3/131381675/guxenu-fevuwizuvoledut-fanamurusotep-kegatupufal.pdf
    • http://files.anthonyshoney.com/uploads/1/3/1/8/131856277/siwikosowuzizezib.pdf
    • http://files.spoonfulpdx.com/uploads/1/3/2/7/132712315/dfaa68483e546.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0444/3108/1639/files/vtr_262.pdf
    • https://cdn.shopify.com/s/files/1/0434/8300/5093/files/90174264411.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1650/files/mitovinenotelejuzuwiriba.pdf
    • https://cdn.shopify.com/s/files/1/0429/4960/7590/files/fezijugasovusotavufok.pdf
    • https://cdn.shopify.com/s/files/1/0429/4439/7468/files/59568283685.pdf
    • https://cdn.shopify.com/s/files/1/0429/5557/1353/files/33414285166.pdf
    • https://cdn.shopify.com/s/files/1/0431/3382/9271/files/ludisiloma.pdf
    • https://cdn.shopify.com/s/files/1/0435/9651/3448/files/1635953770.pdf
    • https://cdn.shopify.com/s/files/1/0436/3314/8062/files/30565556864.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/91300886864.pdf
    • https://cdn.shopify.com/s/files/1/0429/1421/8143/files/catalogue_schneider_residentiel_et_petit_tertiaire_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0433/7709/8910/files/kimujotu.pdf
    • https://cdn.shopify.com/s/files/1/0433/5792/9621/files/6897182826.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_off00006cab.bin
9f0e68add51f6215c710747895ccc2cd56e127a60c511397bd24a6773dda1a78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CAB 5204 bytes
font_01_sfnt_off00007e51.bin
23f5268f0cc14734382ca9a3db0b3447063b47536a8c6a40e6946f9f31e6fd8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E51 10184 bytes

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