Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8c06c608cd25de7…

MALICIOUS

PDF

55.4 KB Created: 2020-08-08 01:25:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10e986c9fc7c16a1bcc343ee4193b1cd SHA-1: 6d8c70bcd0be424332601711a8cbca0a1128150c SHA-256: a8c06c608cd25de7420fd74c2ddf658bfd92c13ced89f5b7efe63684b1830ac0
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.ru'. The document body, though heavily obfuscated, contains the same URL. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many hosted on Shopify, likely for SEO manipulation to lure victims. The ML classifier strongly flagged this PDF as malicious.

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=cargador+solar+para+celular+pdf
    • http://files.genestewartrealestate.com/uploads/1/3/0/7/130740256/9184725.pdf
    • http://files.texaspoliticaljobs.com/uploads/1/3/0/8/130874115/7770518.pdf
    • http://files.eastseidedesign.com/uploads/1/3/0/8/130813413/kegofudijegized.pdf
    • https://cdn.shopify.com/s/files/1/0427/9681/0396/files/nufejuxog.pdf
    • https://cdn.shopify.com/s/files/1/0437/0874/3835/files/mamujerefudokibetejikad.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/51982080438.pdf
    • https://cdn.shopify.com/s/files/1/0432/0333/0208/files/jubimumi.pdf
    • https://cdn.shopify.com/s/files/1/0427/9386/1279/files/nitafenudu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8386/6007/files/36743065705.pdf
    • https://cdn.shopify.com/s/files/1/0431/1895/2612/files/18125764360.pdf
    • https://cdn.shopify.com/s/files/1/0429/4190/7110/files/98365034702.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/86671795136.pdf
    • https://cdn.shopify.com/s/files/1/0430/5007/4269/files/nijosuletigagidobifefar.pdf
    • https://cdn.shopify.com/s/files/1/0432/7673/0533/files/zadoduju.pdf
    • https://cdn.shopify.com/s/files/1/0430/9109/9805/files/50310112928.pdf
    • https://cdn.shopify.com/s/files/1/0432/1987/8048/files/formal_and_informal_email_writing.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/49726552648.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000786c.bin
b9d6e37bc17e9559c54618968b08347c1ff67d2a641b6643f80d2da8dbe1b2ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x786C 5228 bytes
font_01_sfnt_off00008a3c.bin
373bca0e6f8b8f150ff397f4116c25dacecd6aed5a6461789daf4f484aaa3853		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A3C 1656 bytes
font_02_sfnt_off00009291.bin
bf16107c79382a8ab9fb1498910997f8c60e0eb5c0b0d1825a21d463985b864a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9291 11436 bytes
font_03_sfnt_off0000b832.bin
bf8f9ece8d9d74ce2d7a98a07ee1bb8f4056faf702b3b1702118181e85f1b939		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB832 16312 bytes

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