Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fc328d23121a164…

MALICIOUS

PDF

48.8 KB Created: 2020-08-10 06:28:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 75198ac5fd6f6fcdea70d29f18c50c22 SHA-1: 24da55b168f12a69ba876406898f8ee9abdc5e0a SHA-256: 0fc328d23121a164c02b20049d5414f52b01b2f504db039c050d6b6752398e71
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.cc, which is likely used to funnel victims to further malicious content. The document also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDF files, suggesting an attempt to manipulate search engine results or distribute content. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs supports a phishing or redirection attack pattern.

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=censer+trial+pdf
    • http://files.concealedcurrencyentertainment.com/uploads/1/3/1/6/131606284/3048853.pdf
    • http://files.howardcountytaxicab.com/uploads/1/3/0/7/130775950/389caaf872b551.pdf
    • http://files.artemleaders.com/uploads/1/3/0/7/130775116/e5839db.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/8426/6137/files/39023745476.pdf
    • https://cdn.shopify.com/s/files/1/0431/1482/3844/files/figumogoxemenoxas.pdf
    • https://cdn.shopify.com/s/files/1/0433/5625/8454/files/53200956111.pdf
    • https://cdn.shopify.com/s/files/1/0433/3459/8809/files/constructivist_approach_to_research.pdf
    • https://cdn.shopify.com/s/files/1/0432/0185/5646/files/11143016865.pdf
    • https://cdn.shopify.com/s/files/1/0436/0568/8483/files/nipirurodikexe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0792/5654/files/98921830599.pdf
    • https://cdn.shopify.com/s/files/1/0437/6035/3429/files/peer_authentication_failed_for_user.pdf
    • https://cdn.shopify.com/s/files/1/0432/0755/7275/files/48473448233.pdf
    • https://cdn.shopify.com/s/files/1/0435/2930/6272/files/adding_fractions_worksheets.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_off00007571.bin
90bd0ba0737bae800b17505876aaf1df3d3b91867cfac8d1c06062b2ba2c75ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x7571 4940 bytes
font_01_sfnt_off00008649.bin
c83efcf0fb0d2b027f8d6b346ff8636fdb316465287fee36fa8347065a46dca8
pdf-font-stream PDF embedded font (sfnt) at offset 0x8649 15188 bytes