Malicious PDF — malware analysis report

Static analysis result for SHA-256 14d1266a24bad968…

MALICIOUS

PDF

51.1 KB Created: 2020-07-30 07:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3e18c9671abfa3079debc958f63eafab SHA-1: 5fb75bc1be7d133df58b223a0f1a587e04692505 SHA-256: 14d1266a24bad9680a2d6cdb8befc3ead59b5cfd62a2646ed3398273015f9b0d
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body appears to be obfuscated or corrupted, preventing a clear understanding of its intended lure, but the presence of numerous external links suggests a link farm or phishing attempt.

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=biography+writing+format+pdf
    • http://files.bigbuckssupply.com/uploads/1/3/0/7/130740429/lixajapujofe.pdf
    • http://files.easeandexcel.co.uk/uploads/1/3/2/6/132683154/bc27ea8f3271b.pdf
    • http://files.spiritwickcandleco.com/uploads/1/3/1/8/131871992/2017648.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/8168/6437/files/jajonefawesorejowas.pdf
    • https://cdn.shopify.com/s/files/1/0431/8419/3697/files/lizadivanovaxateki.pdf
    • https://cdn.shopify.com/s/files/1/0435/5227/6632/files/wonefibamokididu.pdf
    • https://cdn.shopify.com/s/files/1/0438/2323/5232/files/14111247614.pdf
    • https://cdn.shopify.com/s/files/1/0429/7857/4490/files/81776022753.pdf
    • https://cdn.shopify.com/s/files/1/0432/2027/1264/files/37751893556.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nezax.pdf
    • https://cdn.shopify.com/s/files/1/0436/9947/0486/files/53183751291.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/figarawevig.pdf
    • https://cdn.shopify.com/s/files/1/0430/7353/6161/files/fixunabot.pdf
    • https://cdn.shopify.com/s/files/1/0428/8688/9625/files/pidagisutigipovelep.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_off00008c56.bin
9c222d6ffcfd99fa765da5090dfb883628bc5d7a450ae4e19f1183dd72405fb1
pdf-font-stream PDF embedded font (sfnt) at offset 0x8C56 5156 bytes
font_01_sfnt_off00009dbe.bin
1bcb9a6c3c4a224c6a27184bf5b4b5ee8c7ff213466278ce4d69e01c0e36f45e
pdf-font-stream PDF embedded font (sfnt) at offset 0x9DBE 9728 bytes