Malicious PDF — malware analysis report

Static analysis result for SHA-256 038fea20ed9b0777…

MALICIOUS

PDF

46.3 KB Created: 2020-08-07 21:12:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c3029776b444d1ffbd3cd117eb4ac583 SHA-1: f1f35cd100847e8f730ff60236748f10a0fa3a71 SHA-256: 038fea20ed9b0777f083b85b060bea2cf12a40270295699903a3d19f3ee8b5e7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links, with one specifically pointing to a known malicious redirector. The heuristic firings indicate it's part of a link farm designed to distribute malicious content. The ML classifier strongly supports its malicious nature. The document body, though heavily obfuscated, contains a URL that is also listed as a primary IOC.

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.com/pify?keyword=induction+melting+furnace+design+pdf
    • http://dasuxud.parsonrob.com/uploads/1/3/1/8/131856158/2e2cd52b1fc.pdf
    • http://files.mactire.ie/uploads/1/3/0/7/130775371/tilavemowalovan_kinotejamuwake_vazirixum.pdf
    • http://files.erikssonerik.com/uploads/1/3/0/7/130740142/4036542.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/6402/5493/files/14928229179.pdf
    • https://cdn.shopify.com/s/files/1/0434/1297/9879/files/orespawn_1._7._10_jar.pdf
    • https://cdn.shopify.com/s/files/1/0439/4074/1275/files/83752891083.pdf
    • https://cdn.shopify.com/s/files/1/0444/2229/9815/files/osrs_jad_setup.pdf
    • https://cdn.shopify.com/s/files/1/0430/8307/1650/files/19774924299.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32377204601.pdf
    • https://cdn.shopify.com/s/files/1/0429/1559/4393/files/89419313562.pdf
    • https://cdn.shopify.com/s/files/1/0430/9948/8410/files/dowetawodokugawelopeted.pdf
    • https://cdn.shopify.com/s/files/1/0432/2476/0484/files/bhikhu_parekh_repensando_el_multiculturalismo.pdf
    • https://cdn.shopify.com/s/files/1/0429/3761/4499/files/86880560882.pdf
    • https://cdn.shopify.com/s/files/1/0432/3000/3358/files/vizeku.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f21.bin
24f462bfaaa8d142e12e079d8811dcee3435c929c50c1c26d50254865278a0dd
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F21 5412 bytes
font_01_sfnt_off00008175.bin
5c1fbbba435815306d273b2b34ad74ec8e6889937191db8be23966a391c7868d
pdf-font-stream PDF embedded font (sfnt) at offset 0x8175 13532 bytes