Malicious PDF — malware analysis report

Static analysis result for SHA-256 22854a9eeef4d33d…

MALICIOUS

PDF

47.8 KB Created: 2020-08-13 03:03:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d59e224859df7b6c3f29c9cb582911b4 SHA-1: e0ce4c14077c4edd00f8e447d1908ea39f31d3e4 SHA-256: 22854a9eeef4d33def81c84d5b04ef82f31f215548e9ba19dc0ded2edcad9196
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector. The document body, though heavily obfuscated, contains text suggesting a 'mock test book PDF' lure, and the primary malicious URL is directly referenced. The ML classifier strongly indicates maliciousness. The file is likely a lure to a phishing or malware distribution site.

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.ru/wb?keyword=ibps%20po%20mock%20test%20book%20pdf
    • http://files.climatechheatingcooling.com/uploads/1/3/1/3/131398423/c3fec48.pdf
    • http://files.srphotodesign.com/uploads/1/3/1/0/131070178/bitujewewenuz.pdf
    • http://vukuf.officesupercharger.com/uploads/1/3/2/8/132816202/jipegej.pdf
    • https://cdn.shopify.com/s/files/1/0434/2670/9665/files/6383580774.pdf
    • https://cdn.shopify.com/s/files/1/0431/4421/6730/files/cinderella_short_story_with_pictures.pdf
    • https://cdn.shopify.com/s/files/1/0432/1663/4011/files/kufopadunipiru.pdf
    • https://cdn.shopify.com/s/files/1/0435/9897/1038/files/74156064234.pdf
    • https://cdn.shopify.com/s/files/1/0431/3494/3389/files/docker_swarm_vs_kubernetes.pdf
    • https://cdn.shopify.com/s/files/1/0438/9991/2344/files/autocratic_leadership_questionnaire.pdf
    • https://cdn.shopify.com/s/files/1/0437/0379/5877/files/gawotexeraxobomaju.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/43106273748.pdf
    • https://cdn.shopify.com/s/files/1/0434/7245/3784/files/2754650037.pdf
    • https://cdn.shopify.com/s/files/1/0437/5104/7329/files/74558139420.pdf
    • https://cdn.shopify.com/s/files/1/0427/7505/2454/files/fapabegiwuje.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/39858795743.pdf
    • https://cdn.shopify.com/s/files/1/0428/3881/8982/files/72225099760.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000689b.bin
8de03bdeb64588676979ee1d37fa294cf70541c6c1750264ad8d5419d1365ec2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x689B 5104 bytes
font_01_sfnt_off000079e5.bin
07efc41741857670263f167b68a92597c0a1f02f709bfc0861443ef0b514040e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79E5 10224 bytes
font_02_sfnt_off00009cf2.bin
0d7a92828fb34c46272def7401d297891c72c028a4bdfa4d2814ce18bde6b281		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CF2 16164 bytes

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