Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d24a20be1cf209a…

MALICIOUS

PDF

48.3 KB Created: 2020-08-11 07:46:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6cd55a915678dbb7245d17490e9ec000 SHA-1: 031cf0ebb7449ad6e1a911da006e114d651ee565 SHA-256: 7d24a20be1cf209ae58759e8448c34b3b507409d9824b604323b495ad4441ef7
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector. The document body, though heavily obfuscated, contains the same URL, suggesting an attempt to trick users into clicking it. The ML classifier also strongly indicated maliciousness, supporting the conclusion that this PDF is designed to lead users to malicious infrastructure.

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=deontology+philosophy+pdf
    • http://files.decision-camp.com/uploads/1/3/2/6/132681294/4ffc00a1c3.pdf
    • http://files.clearpathemployer.com/uploads/1/3/1/3/131383544/01eb14ca502.pdf
    • http://files.bcsgrubbox.com/uploads/1/3/0/8/130813601/8bb0c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/9977/5381/files/51555274997.pdf
    • https://cdn.shopify.com/s/files/1/0428/9455/7347/files/vimopexibijujupa.pdf
    • https://cdn.shopify.com/s/files/1/0430/4932/0597/files/86662105008.pdf
    • https://cdn.shopify.com/s/files/1/0432/1466/7934/files/lefatoxuseputedowanu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5843/8056/files/retencion_placentaria_humana.pdf
    • https://cdn.shopify.com/s/files/1/0427/8606/2495/files/70921477828.pdf
    • https://cdn.shopify.com/s/files/1/0435/9494/0573/files/assistant_system_engineer_tnpsc_books.pdf
    • https://cdn.shopify.com/s/files/1/0435/4169/2570/files/al_final_mueren_los_dos_libro.pdf
    • https://cdn.shopify.com/s/files/1/0430/7527/2855/files/60550569959.pdf
    • https://cdn.shopify.com/s/files/1/0433/3892/4181/files/vusuwasidinotapaz.pdf
    • https://cdn.shopify.com/s/files/1/0433/5940/4197/files/wigejovi.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_off00007cb4.bin
b498b219679b9cf6f0f3b96d45577694aa802e0e84323f246a981817f2500550
pdf-font-stream PDF embedded font (sfnt) at offset 0x7CB4 5100 bytes
font_01_sfnt_off00008e1c.bin
f6a6a8612fd1d2b8612c86bea7557814829ccd310a6945c952f1bbc37c655a55
pdf-font-stream PDF embedded font (sfnt) at offset 0x8E1C 11344 bytes