Malicious PDF — malware analysis report

Static analysis result for SHA-256 923261cb55fddc26…

MALICIOUS

PDF

49.8 KB Created: 2020-08-08 13:00:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37ba9375d3ec2cb29518da510d303aa2 SHA-1: 61da58136ef8d581022f67df8e7bf7a0c31ca6c0 SHA-256: 923261cb55fddc26882cce4b65caa42cd58a0b1066c6109d9d89918e3fbfa88f
152 Risk Score

Malware Insights

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

The PDF document was flagged as malicious due to a critical heuristic identifying it as a link farm containing numerous external links. One of these links, 'https://ttraff.ru/pify?keyword=ford+tractor+parts+manual+pdf', points to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains similar text and the same malicious URL, suggesting the document's primary purpose is to lure users into clicking malicious links.

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=ford+tractor+parts+manual+pdf
    • http://sivujodu.ssppwisrapids.org/uploads/1/3/0/7/130739564/felolobizalof.pdf
    • http://files.allergyfreeprincess.com/uploads/1/3/1/6/131636692/kigizudixewalix.pdf
    • http://files.allpraisesapparel.com/uploads/1/3/0/8/130814017/8201354.pdf
    • https://cdn.shopify.com/s/files/1/0431/4093/9933/files/gaxabijoxaxeraxa.pdf
    • https://cdn.shopify.com/s/files/1/0435/5276/8151/files/vesaz.pdf
    • https://cdn.shopify.com/s/files/1/0435/2750/4024/files/8083374244.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3087/files/usssa_baseball_rules.pdf
    • https://cdn.shopify.com/s/files/1/0437/0114/1657/files/12114265656.pdf
    • https://cdn.shopify.com/s/files/1/0428/7247/1718/files/betofutararetovuguges.pdf
    • https://cdn.shopify.com/s/files/1/0431/3956/3686/files/xapamatude.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wexidemunuviviradepinitim.pdf
    • https://cdn.shopify.com/s/files/1/0434/7274/8710/files/birisadipolavadozepokuw.pdf
    • https://cdn.shopify.com/s/files/1/0435/6925/0463/files/ain_t_no_sunshine_piano_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0438/2241/6029/files/24298537463.pdf
    • https://cdn.shopify.com/s/files/1/0435/1678/8890/files/gafawufe.pdf
    • https://cdn.shopify.com/s/files/1/0428/4832/1692/files/zibetiduxeb.pdf
    • https://cdn.shopify.com/s/files/1/0434/8212/0357/files/tinavarikejuturiv.pdf
    • https://cdn.shopify.com/s/files/1/0434/0419/8044/files/74413779828.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_off00008493.bin
a155172e36a7d9d9a8d67a995e23b6bb5dd9b994fe2226a4f1640150997f6c48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8493 5256 bytes
font_01_sfnt_off00009661.bin
73a4d4125ee5b1573df3dda0ec16bada91ca6793d60f071e24233ce3bd63eaf5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9661 10600 bytes

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