Malicious PDF — malware analysis report

Static analysis result for SHA-256 1761d6df784497a3…

MALICIOUS

PDF

43.8 KB Created: 2020-09-01 16:57:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 245cea7dd50e8e9a3c78eb4f33070f85 SHA-1: 506ead9e32cdab3ee938ae7653d94c1eedb1a631 SHA-256: 1761d6df784497a3e799c2d0d4506c92f1477f5de85cba0dc9c55a0e4ec553b3
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised as academic report writing resources. This heuristic, combined with the ML classifier's high confidence, indicates a phishing or malicious redirection attempt. The document body also contains numerous links to external PDFs, suggesting a link farm or SEO poisoning tactic to distribute malicious 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.com/wix?keyword=academic+report+writing+format+for+students
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/76156b_e75fca1b04d9449fbefd7bc757aee20e.pdf
    • https://static.usrfiles.com/ugd/b8c837_361361c48d774611bbb67d4743eaf568.pdf
    • https://static.usrfiles.com/ugd/b8c837_69ebd400c59e461aac51a34e190e0bb3.pdf
    • https://static.usrfiles.com/ugd/b8c837_849ea72b66b94d2296ea6375bc26e85b.pdf
    • https://static.usrfiles.com/ugd/74a852_de65f1a435044b6096beae0d2f7949c7.pdf
    • https://static.usrfiles.com/ugd/b85eb0_a46879fb132a404a8eb98f50fae0ac9c.pdf
    • https://cdn.shopify.com/s/files/1/0430/9857/0909/files/9458297209.pdf
    • https://cdn.shopify.com/s/files/1/0433/5383/3637/files/xodolegexipo.pdf
    • https://cdn.shopify.com/s/files/1/0434/1635/4978/files/10038417269.pdf
    • https://cdn.shopify.com/s/files/1/0435/7819/6129/files/62998564376.pdf
    • https://cdn.shopify.com/s/files/1/0439/0918/5691/files/3742454586.pdf
    • https://cdn.shopify.com/s/files/1/0429/2804/6233/files/zosaviwivuvevogavo.pdf
    • http://www.flickr.com/photos/alamosbasement/
    • 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_off00006e12.bin
8674eab4ebca302fcb4e6a709b945432268a90e26388dc46a29ab88c96c9af19
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E12 5524 bytes
font_01_sfnt_off000080dc.bin
ea5e7474fc0dd8dc2f1eb2d6a080207d898372e7276a8af9e4e3cb6fe7cfe07e
pdf-font-stream PDF embedded font (sfnt) at offset 0x80DC 9864 bytes