Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f5a64406fcc2e52…

MALICIOUS

PDF

40.9 KB Created: 2020-08-30 11:43:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3d3198297dc127b4a609ce1e74995eb SHA-1: e1b4cec840b375e75c37720fa9d376e9db04f42c SHA-256: 0f5a64406fcc2e52e03615a915044ab18cf5b9f45fb75ed29a95a241454cf589
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, which is indicative of a link farm or SEO spam campaign. One critical heuristic identified a link to known malicious redirector infrastructure at `https://ttraff.cc/wix?keyword=alternating+current+machines+mg+say+pdf`. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the embedded links and the nature of the heuristics suggest a malicious intent to redirect users to harmful 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.cc/wix?keyword=alternating+current+machines+mg+say+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/2325/4179/files/98703594246.pdf
    • https://cdn.shopify.com/s/files/1/0438/4620/5602/files/94703222366.pdf
    • https://cdn.shopify.com/s/files/1/0430/6019/9573/files/tibodu.pdf
    • https://cdn.shopify.com/s/files/1/0466/5232/6053/files/ni3_molecular_geometry.pdf
    • https://cdn.shopify.com/s/files/1/0435/5260/4319/files/17263516517.pdf
    • https://cdn.shopify.com/s/files/1/0437/2067/1400/files/kupibafobedibitexegotoxow.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/4155504299.pdf
    • https://static.usrfiles.com/ugd/b8c837_a107a1d0827641bd97289a95c729bf0a.pdf
    • https://static.usrfiles.com/ugd/4b7290_0f28a48a171843a68b4738a23bb98a4d.pdf
    • https://cdn.shopify.com/s/files/1/0435/5581/5583/files/cedrela_odorata_l.pdf
    • https://cdn.shopify.com/s/files/1/0438/6373/6475/files/controlling_amyloid_fibril_formation_by_partial_stirring.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_off0000614a.bin
13ea31d7b4c2d942824ab77825995ca9d2e4a3601b3ba9a7277620395df9923e
pdf-font-stream PDF embedded font (sfnt) at offset 0x614A 5660 bytes
font_01_sfnt_off00007467.bin
581533920b0c807f461f7d4802aa678141ee80d319345f9285ca9f55390c9597
pdf-font-stream PDF embedded font (sfnt) at offset 0x7467 10120 bytes