Malicious PDF — malware analysis report

Static analysis result for SHA-256 81c9e6e13a6aa374…

MALICIOUS

PDF

33.4 KB Created: 2020-08-05 08:24:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15ba4ab803da82282d693af36fac48ca SHA-1: 40c3a0d431bbc36aa837a18253fa109fe28d14ff SHA-256: 81c9e6e13a6aa3748cde6354a117d2eb2f60216b06a7dd5cced3762e9db1af85
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'ttraff.com'. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=careless+whisper+tab+guitar+pdf', suggesting a lure to a malicious site. The presence of numerous other PDF links, many pointing to unknown domains, further supports the malicious intent of a link farm or phishing campaign.

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/pify?keyword=careless+whisper+tab+guitar+pdf
    • http://poxaj.coxptsa.com/uploads/1/3/1/6/131606349/2033776.pdf
    • http://files.athenscountystorage.com/uploads/1/3/1/4/131410812/fb11663c9.pdf
    • http://files.futfemuniversal.com/uploads/1/3/2/6/132681156/4129992.pdf
    • http://files.bwrys.com/uploads/1/3/0/7/130775245/3b7c117a9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/8507/8423/files/vepigovefozunijunari.pdf
    • https://cdn.shopify.com/s/files/1/0427/6482/8838/files/24982448672.pdf
    • https://cdn.shopify.com/s/files/1/0430/8307/1650/files/17503587140.pdf
    • https://cdn.shopify.com/s/files/1/0429/9735/0554/files/zokukevefijiwukedebe.pdf
    • https://cdn.shopify.com/s/files/1/0431/7849/2072/files/52865378535.pdf
    • https://cdn.shopify.com/s/files/1/0430/2408/9242/files/27061542497.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/10809735118.pdf
    • https://cdn.shopify.com/s/files/1/0439/1161/0520/files/after_ever_happy_study_novels.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/69901941500.pdf
    • https://cdn.shopify.com/s/files/1/0432/8184/2341/files/vujezokidonowexesit.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_off00004415.bin
58b754e71346ba4e460d1bd9844e0231f622c8d55539f961f65242fcbb8fcf00
pdf-font-stream PDF embedded font (sfnt) at offset 0x4415 5440 bytes
font_01_sfnt_off00005697.bin
cf19d2f42effa98de377c92e72c995c0a8c0d38e7c425ed259e8cff5d1438f6e
pdf-font-stream PDF embedded font (sfnt) at offset 0x5697 10072 bytes