Malicious PDF — malware analysis report

Static analysis result for SHA-256 0964719018cc4fee…

MALICIOUS

PDF

38.1 KB Created: 2020-09-02 11:13:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 721130a1d10556b04a4c06586e1a00e0 SHA-1: 3babdcdf60edb77ee46b4095fe832a31675b767e SHA-256: 0964719018cc4feeaa4a527987fbf60995fdffb6b8f3f04e28927cd7bd305eec
154 Risk Score

Malware Insights

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

The PDF document contains a link farm and a redirector URL, suggesting a phishing or scam attempt disguised as a "Ck belt size guide". The ML classifier strongly indicated maliciousness, and the presence of numerous external links points to a potential SEO poisoning or link farm attack. No scripts were extracted, but the document's structure and embedded URLs are highly suspicious.

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/wix?keyword=ck+belt+size+guide
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/8008/9760/files/fukuworosi.pdf
    • https://cdn.shopify.com/s/files/1/0432/0860/5859/files/negijuvaserutilexovuvalo.pdf
    • https://cdn.shopify.com/s/files/1/0427/5470/3526/files/3629031244.pdf
    • https://cdn.shopify.com/s/files/1/0437/5881/3333/files/mavifirixojitivuk.pdf
    • https://cdn.shopify.com/s/files/1/0430/8221/9674/files/zetuze.pdf
    • https://cdn.shopify.com/s/files/1/0429/8221/1733/files/43795552918.pdf
    • https://cdn.shopify.com/s/files/1/0431/7482/2044/files/runuvuvetas.pdf
    • https://cdn.shopify.com/s/files/1/0440/5588/8022/files/lafumanedopi.pdf
    • https://static.usrfiles.com/ugd/19ce5d_a3715740d5b6487d81cac3e82857fb3e.pdf
    • https://static.usrfiles.com/ugd/23e9be_308575b1208d444f9e9764d28c489104.pdf
    • https://static.usrfiles.com/ugd/906e9f_7ba48428621e4922b6f2b4a105010355.pdf
    • https://static.usrfiles.com/ugd/590778_c9292a0567c744ee9764407ac01f7bc3.pdf
    • https://static.usrfiles.com/ugd/e66789_69fb569f2e0f4ccf935edc6897cd4ca2.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_off000059f6.bin
2eac6e4dc9e66e13cc814e772257d407fcca14a31e83920a35c3ae08134406ea
pdf-font-stream PDF embedded font (sfnt) at offset 0x59F6 4848 bytes
font_01_sfnt_off00006a8c.bin
f8225d733fd1915d1d7705713e12a23674dfb2b57860dc43914bb997d04c43dc
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A8C 9764 bytes