Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f8d58ed88ddf038…

MALICIOUS

PDF

44.0 KB Created: 2020-07-27 23:36:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 786edb7901ee4b5548c04d22e53ffee1 SHA-1: 78fc3406af0597679d4bdc3b2d183aceb3ea02c7 SHA-256: 6f8d58ed88ddf0386e6530ce4975690a404949137254286a12cbe9795b391c07
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains a significant number of embedded links, identified as a link farm, directing users to potentially malicious or SEO-manipulated content. One critical heuristic specifically flagged a link to a known malicious redirector. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the structure and heuristics point towards a malicious document designed to redirect users to harmful sites.

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=causal+factor+charting+template
    • http://files.benefitsselection.com/uploads/1/3/1/6/131637409/7567aad047269.pdf
    • http://files.tfcrecycling.com/uploads/1/3/1/4/131438840/lerixigelizevopu.pdf
    • http://files.gwensnewandused.org/uploads/1/3/0/8/130814588/18bcd7f10dc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/8526/7097/files/34830091559.pdf
    • https://cdn.shopify.com/s/files/1/0433/6903/7974/files/lobefakutizeb.pdf
    • https://cdn.shopify.com/s/files/1/0432/1076/8546/files/1685447127.pdf
    • https://cdn.shopify.com/s/files/1/0434/5544/7202/files/redidawiderufuw.pdf
    • https://cdn.shopify.com/s/files/1/0438/0898/1153/files/26171419118.pdf
    • https://cdn.shopify.com/s/files/1/0427/5575/2103/files/46846413090.pdf
    • https://cdn.shopify.com/s/files/1/0431/8186/7176/files/15670119037.pdf
    • https://cdn.shopify.com/s/files/1/0433/0507/4838/files/93817469839.pdf
    • https://cdn.shopify.com/s/files/1/0437/0418/9096/files/rugupekot.pdf
    • https://cdn.shopify.com/s/files/1/0431/8615/9767/files/nedoreguduxafixug.pdf
    • https://cdn.shopify.com/s/files/1/0431/4152/9762/files/14509238997.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_off00006f95.bin
9005c12d373c61ada9201b7d77746ed2592a7bc0691a779993b87487acf435bc
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F95 5332 bytes
font_01_sfnt_off00008183.bin
8384fcedaf6396486699b1dddf73c73491a979e5b3289f9877b085b95edada3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x8183 9816 bytes