Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bcf8078405984c2…

MALICIOUS

PDF

120.3 KB Created: 2020-07-31 05:43:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7d6da6508d549348d3ad12282fba210e SHA-1: 1900505a304486c55fac465496440836487854b7 SHA-256: 7bcf8078405984c23e1bafe78c9c71235c260aa5d72fbf0c2ceac4586157b27a
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a coordinated effort to distribute malicious content or phish users. The ML classifier also strongly flagged this PDF as malicious.

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=spc+aiag+pdf+espa%25C3%25B1ol
    • http://files.photographersrendezvous.com/uploads/1/3/1/4/131437087/9010343.pdf
    • http://files.petermichaeldavison.com/uploads/1/3/0/8/130813982/bokavifurenis.pdf
    • http://files.rememberministries.org/uploads/1/3/0/8/130874085/6a28e667ff6e135.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/6890/0006/files/bemuwuruwezazox.pdf
    • https://cdn.shopify.com/s/files/1/0433/1179/2286/files/nabarij.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/1402562920.pdf
    • https://cdn.shopify.com/s/files/1/0435/0076/5336/files/deduwukisusitufuvi.pdf
    • https://cdn.shopify.com/s/files/1/0428/4029/3543/files/tatusepediwume.pdf
    • https://cdn.shopify.com/s/files/1/0432/5769/2315/files/45698067485.pdf
    • https://cdn.shopify.com/s/files/1/0431/0417/4233/files/26235508287.pdf
    • https://cdn.shopify.com/s/files/1/0431/4995/1138/files/durixuva.pdf
    • https://cdn.shopify.com/s/files/1/0431/5407/9904/files/gugomimifafagavefaguz.pdf
    • https://cdn.shopify.com/s/files/1/0432/4923/8179/files/95273074345.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_off00019286.bin
3999f7d26c2b2c6cd456b664070087c6bccb170767a8a7987733f5e041e430a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x19286 5144 bytes
font_01_sfnt_off0001a405.bin
8749177176597e30e501e36343d59b1fe5aec0d7a2099a6b6f260df34f952ac4
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A405 15100 bytes