Malicious PDF — malware analysis report

Static analysis result for SHA-256 7776551e4a640460…

MALICIOUS

PDF

39.1 KB Created: 2020-08-18 17:43:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15515305d209f68b0f31b1f8d6f54d2b SHA-1: 4f843d236682cf184d583998368b4e30c9f0f090 SHA-256: 7776551e4a640460aee9b92993b9c54c01117a917e7ad25cfbd07de82d170d1f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one critical heuristic identifying a link to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the target URL and appears to be a lure for search engine traffic. The presence of many external PDF links suggests a link farm or SEO manipulation tactic to distribute malicious 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.ru/pify?keyword=precalculus+textbook+answers+pearson
    • http://gakedena.runningwildmidwest.com/uploads/1/3/2/6/132695535/3036046.pdf
    • http://jujije.emiratescabincrew.co.uk/uploads/1/3/1/4/131483083/68e9c1745fdc.pdf
    • http://files.heartxoutfitters.com/uploads/1/3/0/7/130738799/kupanesumogit_niwuf_davol_xamojovag.pdf
    • http://files.azbasketballcoaches.com/uploads/1/3/1/3/131384589/pojunejowe.pdf
    • http://wipopawu.marryuscaroline.com/uploads/1/3/1/0/131070420/9732896.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0438/6376/9243/files/94671861752.pdf
    • https://cdn.shopify.com/s/files/1/0432/1496/2848/files/agnus_dei_piano_chords.pdf
    • https://cdn.shopify.com/s/files/1/0430/1085/0979/files/18844725970.pdf
    • https://cdn.shopify.com/s/files/1/0435/6489/2323/files/24063636745.pdf
    • https://cdn.shopify.com/s/files/1/0433/1051/4334/files/gifofiviganewakeja.pdf
    • https://cdn.shopify.com/s/files/1/0435/0178/1156/files/97666531642.pdf
    • https://cdn.shopify.com/s/files/1/0437/4138/0759/files/zadomuwisemalaw.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/20931566490.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_off000045c2.bin
76c8d8803790de2cc86fbec44a559e9820340751f9476319dfed2ca3cd56427c
pdf-font-stream PDF embedded font (sfnt) at offset 0x45C2 5128 bytes
font_01_sfnt_off00005745.bin
1cc50dfd0b0781d1fa423ee1f36151c0bd1a8144d43c92488d0a23ca5fe6b52b
pdf-font-stream PDF embedded font (sfnt) at offset 0x5745 13612 bytes
font_02_sfnt_off0000816e.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0x816E 4324 bytes