Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9142477faec04bb…

MALICIOUS

PDF

72.6 KB Created: 2020-11-05 07:46:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb2430a8a856dc9e4264c69a39292f20 SHA-1: 7cdffea97a432900e0cefc452ce69c8218dafe3e SHA-256: d9142477faec04bb6a69414fa96b87c0e94c5c16be774c61b7079e2ae494fe65
162 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, specifically a URL associated with a redirector. The document body also contains a call-to-action phrase and a URL that appears to be part of a link farm, suggesting a phishing or scam attempt. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ggtraff.ru/strik?keyword=kul+tiran+leatherworking+guide
    • https://jobubati.weebly.com/uploads/1/3/1/4/131453688/ca710ab8dee.pdf
    • https://cdn-cms.f-static.net/uploads/4425483/normal_5f99dee8cb109.pdf
    • https://cdn-cms.f-static.net/uploads/4426558/normal_5f9c4d259ada9.pdf
    • https://cdn-cms.f-static.net/uploads/4386595/normal_5fa26f6347a35.pdf
    • https://cdn-cms.f-static.net/uploads/4386334/normal_5f905792df9d9.pdf
    • https://cdn-cms.f-static.net/uploads/4370302/normal_5f8d4de9397ef.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/viboxikuz/proportional_relationships_graphs_worksheets.pdf
    • https://uploads.strikinglycdn.com/files/9639e6ed-4ac0-425f-876e-4f07c9c4653b/best_self_be_you_only_better_reviews.pdf
    • https://s3.amazonaws.com/dutuzanob/mr_vs_mx.pdf
    • https://s3.amazonaws.com/jifesu/ximozas.pdf
    • https://s3.amazonaws.com/gopuze/68035753811.pdf
    • https://s3.amazonaws.com/jifesu/download_apk_cheat_engine_android_no_root.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2e2.bin
092ed94f473482a72a16562d85298a301ffb620fe3f56c2508fca78a18d2d500		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E2 3572 bytes
font_01_sfnt_off0000df99.bin
a4ca100eea99ebb965e4528e01d1ce8bc56736e62d993d5f3087bc18822b4efe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF99 5036 bytes
font_02_sfnt_off0000f0c1.bin
f1dbf7293a3400ac75977e5511474d3094d6c2071f5806f31b1d71c72ab4c3a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C1 10664 bytes

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