Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c96c94c2d6ebce5…

MALICIOUS

PDF

39.7 KB Created: 2020-08-29 02:04:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 94001bbceec16237f91962e6483dd8c5 SHA-1: 8de5f56ccd1a33a775d310f6b2f801b2c2cda10f SHA-256: 0c96c94c2d6ebce53396aa892bd4b4408b16b2ceefcd469b04c18e8bba2f64b7
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, disguised as a free download for Windows 8.1. The document body and embedded URLs suggest a link farm designed to drive traffic to potentially malicious sites. While no scripts were explicitly extracted, the presence of embedded URLs and the heuristic firings indicate a phishing or malware distribution attempt.

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=windows+8.1+free+download+iso+64+bit
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0450/5609/8456/files/parent_functions_and_transformations_guided_notes.pdf
    • https://cdn.shopify.com/s/files/1/0429/2398/3001/files/lopowozigolalaxuxakewosi.pdf
    • https://cdn.shopify.com/s/files/1/0432/7912/2587/files/70655781796.pdf
    • https://cdn.shopify.com/s/files/1/0437/9623/4400/files/romefogeruwoz.pdf
    • https://static.usrfiles.com/ugd/b8c837_139a9c5d3b4441b29ca999ea5cdc596e.pdf
    • https://static.usrfiles.com/ugd/b8c837_1e767dd5639445e2818aecc505d05f85.pdf
    • https://static.usrfiles.com/ugd/b8c837_2a2e8e66c18a498cbc81d98abc945bcc.pdf
    • https://static.usrfiles.com/ugd/b8c837_02fc83144f7545f687d0250a539dcb4b.pdf
    • https://cdn.shopify.com/s/files/1/0436/3078/8758/files/92906575536.pdf
    • https://cdn.shopify.com/s/files/1/0434/4614/1093/files/anglo_dutch_translation_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/5428/4450/files/komotatebodujafa.pdf
    • https://cdn.shopify.com/s/files/1/0433/3853/0965/files/83275126601.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_off00005b83.bin
972623e3e793bcefb42c465b8535a15e8d679991f5d7d15ba1a1581886b93a17
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B83 5664 bytes
font_01_sfnt_off00006efc.bin
0317632081e83d503a3dd6c5881520c106ced177fa43679f24839e1ee785b957
pdf-font-stream PDF embedded font (sfnt) at offset 0x6EFC 10220 bytes