Malicious PDF — malware analysis report

Static analysis result for SHA-256 0942ca1732441800…

MALICIOUS

PDF

39.4 KB Created: 2020-08-30 21:43:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 159919b15b6148cc992c8ffd39144310 SHA-1: fdd348d4c19049dbfed9b60262540186b969f2c2 SHA-256: 0942ca173244180086980ba2b29e517cb8b1b7dbc7cf2853b6feab3bfc6cb15f
154 Risk Score

Malware Insights

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

The PDF contains embedded links and text that masquerade as a downloadable math question bank, but the primary link redirects to a malicious infrastructure. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and the presence of numerous other PDF links suggest a link farm or SEO poisoning tactic to drive traffic to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or redirection 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.me/wix?keyword=kpss+matematik+soru+bankas%2525C4%2525B1+pdf+indir
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6577/8080/files/pituruwo.pdf
    • https://cdn.shopify.com/s/files/1/0431/5417/8216/files/94533951535.pdf
    • https://cdn.shopify.com/s/files/1/0429/7415/0809/files/antiphospholipid_syndrome_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0430/7664/9121/files/ghost_recon_wildlands_predator_locat.pdf
    • https://static.usrfiles.com/ugd/b8c837_51d76e8191ad4e54acb8116c35b0e87a.pdf
    • https://cdn.shopify.com/s/files/1/0432/3367/3380/files/63994572439.pdf
    • https://cdn.shopify.com/s/files/1/0429/8624/2209/files/25482766907.pdf
    • https://cdn.shopify.com/s/files/1/0433/4757/4949/files/walebitotum.pdf
    • https://cdn.shopify.com/s/files/1/0427/8226/1415/files/8796703353.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_off00005755.bin
3fe9039f263277ad02308f1c2bb6dfb0af0b9ecf46f925e0730ca92d319e8cba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5755 5360 bytes
font_01_sfnt_off00006970.bin
5a931cad238c33ad0daa86629331c37d291bf926a95646cde356f0546d5449aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6970 12108 bytes

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