Malicious PDF — malware analysis report

Static analysis result for SHA-256 935e0f432295f3e5…

MALICIOUS

PDF

49.0 KB Created: 2020-08-06 17:42:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a18d60937cc5739972a8d53ad242f54 SHA-1: 76363ab0d23a723922607b95d6910933247f2ef5 SHA-256: 935e0f432295f3e5a06398f0383b8807d1251edecdafc02de70b6e71aec61d3d
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/pify?keyword=general+characters+of+bryophytes+pdf'. The document body, though heavily obfuscated, contains this URL, suggesting it's the primary lure. The PDF also contains a link farm heuristic, indicating it's part of a larger SEO poisoning effort to distribute malicious content. 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.cc/pify?keyword=general+characters+of+bryophytes+pdf
    • http://woden.autobuysell.com/uploads/1/3/0/7/130739385/gewobaxazazo-noletonugus-xarodadumurup.pdf
    • http://files.localorganicyall.org/uploads/1/3/1/6/131606003/410991.pdf
    • http://files.starbrightpoolcare.com/uploads/1/3/2/6/132695663/tutetaxibus-fifujena-lerakek-bapisano.pdf
    • http://files.shannonrobertsmith.com/uploads/1/3/0/7/130776609/1063697.pdf
    • http://files.dawnssparklebox.net/uploads/1/3/1/1/131164425/givujeri-fajetipopapase-dikisutib.pdf
    • https://cdn.shopify.com/s/files/1/0429/0537/0787/files/fivexosojiratizuzeto.pdf
    • https://cdn.shopify.com/s/files/1/0433/1434/8197/files/budetax.pdf
    • https://cdn.shopify.com/s/files/1/0433/9236/8798/files/68842784356.pdf
    • https://cdn.shopify.com/s/files/1/0435/5116/2523/files/life_cycle_of_cestodes.pdf
    • https://cdn.shopify.com/s/files/1/0430/3906/4225/files/jasaferafozawojurikebum.pdf
    • https://cdn.shopify.com/s/files/1/0435/9480/9512/files/xupetavufatira.pdf
    • https://cdn.shopify.com/s/files/1/0429/3492/7513/files/pivalodipebalinakunuvuro.pdf
    • https://cdn.shopify.com/s/files/1/0435/2537/4103/files/charles_bettelheim_class_struggles_in_the_ussr.pdf
    • https://cdn.shopify.com/s/files/1/0433/6913/6284/files/robajigimawa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0625/4494/files/rogaxadijududixi.pdf
    • https://cdn.shopify.com/s/files/1/0437/6231/9517/files/satosoxovizezuwivatiluwes.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_off0000747b.bin
31a44d033c88b9b3fcc5ca851dd513b8c01f602f5f3b7a6867aebcbb2b51fd40		 pdf-font-stream PDF embedded font (sfnt) at offset 0x747B 5256 bytes
font_01_sfnt_off0000864f.bin
671a73c38a3339f734f12c57914061512c005bb7bfe54196f6e0e9c9ede97467		 pdf-font-stream PDF embedded font (sfnt) at offset 0x864F 10012 bytes
font_02_sfnt_off0000a8a5.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA8A5 4324 bytes

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