Malicious PDF — malware analysis report

Static analysis result for SHA-256 61619ae398f3fa7b…

MALICIOUS

PDF

44.6 KB Created: 2020-08-09 17:22:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a30f72e500d3c675d7e8abe96f779c1 SHA-1: 3abaeb53d84bb4162cceb6ff7b0e7b7af70a11ee SHA-256: 61619ae398f3fa7b805432d57ac4aee5e30fad99bc4e7c4dd0503d2cdf046369
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure related to 'distress tolerance PDF'. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM strongly indicate malicious intent, likely to direct users to phishing or scam 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=tipp+distress+tolerance+pdf
    • http://files.erinmdesign.com/uploads/1/3/0/7/130776266/0c1418f6fdcd6.pdf
    • http://files.commafultips.com/uploads/1/3/2/7/132712006/bejirajut_pezekuzeroz_rifikudo_geroromewav.pdf
    • http://files.knightoncommunitycentre.com/uploads/1/3/0/7/130775672/fakimasa-wuxepet-ruxese-ropifopekejevo.pdf
    • http://nifadim.glenmontpta.org/uploads/1/3/0/7/130739590/sabom.pdf
    • http://kusevum.shopcfs.com/uploads/1/3/2/6/132681579/novukiwebasidi-dixag-dugepawixo-vinukaruf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/5598/8374/files/36203481605.pdf
    • https://cdn.shopify.com/s/files/1/0432/0667/2546/files/50001856364.pdf
    • https://cdn.shopify.com/s/files/1/0434/1356/9690/files/78989107731.pdf
    • https://cdn.shopify.com/s/files/1/0433/3237/0584/files/82357532613.pdf
    • https://cdn.shopify.com/s/files/1/0429/5157/3657/files/mezujozako.pdf
    • https://cdn.shopify.com/s/files/1/0435/4395/3563/files/ditejom.pdf
    • https://cdn.shopify.com/s/files/1/0432/8570/8953/files/16654579263.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3087/files/pifiratafukudobuxu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7485/4820/files/kabimeb.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000644a.bin
43c3a9f7413405733a85025d321e7d93e2cdc0d320b1c7bef583e69202bfd328		 pdf-font-stream PDF embedded font (sfnt) at offset 0x644A 4888 bytes
font_01_sfnt_off000074f3.bin
b77656e2ada00c3a3aa0d474b946b54535e6347c637b25d3bd2b5e3b38c42215		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74F3 10140 bytes
font_02_sfnt_off000097a6.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97A6 4324 bytes

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