Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae43b202a10dc0aa…

MALICIOUS

PDF

67.6 KB Created: 2020-12-17 21:45:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e936056d5bda12eebe26f2778da831ff SHA-1: a9633a648a81a33b28de71fa0eb56fc78844c7cc SHA-256: ae43b202a10dc0aad0c3f814fcb45db46820590fb783dfa23e7764756f81bfdd
154 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, pointing to 'https://traffmen.ru/strik?utm_term=in+law+relationships+chart'. The document body, though heavily obfuscated, suggests a lure related to legal relationships. The ML classifier and ClamAV detection further support the malicious nature of this PDF, likely used as a spearphishing attachment to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffmen.ru/strik?utm_term=in+law+relationships+chart
    • https://static.s123-cdn-static.com/uploads/4470979/normal_5fceb8599c2d8.pdf
    • https://cdn-cms.f-static.net/uploads/4410030/normal_5f92deb995a3a.pdf
    • https://cdn-cms.f-static.net/uploads/4365628/normal_5f870a8c7d7bf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc2b4fb104edf1d778c99fd/t/5fc54971e18c5c478ea92e18/1606764914718/liwetubakeniwexitijevo.pdf
    • https://uploads.strikinglycdn.com/files/e54938ab-c8af-43dd-b129-447f030a49d8/songs_about_crushes_2018.pdf
    • https://static1.squarespace.com/static/5fce9f7ef127c57ce14fe504/t/5fd65cc69264095525d2ec81/1607883974840/annabelle_creation_movie_hd_in_tamil.pdf
    • https://uploads.strikinglycdn.com/files/d5610126-5db0-4e37-b6a5-0830fac5cd9c/9057877355.pdf
    • https://static1.squarespace.com/static/5fc528842cf09257bd8747f2/t/5fc68ecef8cdb769c6c8606f/1606848208344/racer_underground_hack_download.pdf
    • https://uploads.strikinglycdn.com/files/7a044594-19f2-4ee1-a789-85fe65e42cee/fosuwolexofa.pdf
    • https://uploads.strikinglycdn.com/files/32c6f4b1-c37c-45ea-ab5f-0ab0e380fbf8/millennium_3d_chess_rules.pdf
    • https://uploads.strikinglycdn.com/files/a7ae1da3-e872-4903-a352-42c647bb6f9f/33201767900.pdf
    • https://uploads.strikinglycdn.com/files/7aa1c49b-cb08-425d-af80-c471b7dc3287/baptiste_lecaplain_torrent.pdf
    • https://uploads.strikinglycdn.com/files/cf4dc8bd-1691-467a-be51-cec37b90bff7/pegasus_vs_unicorn_vs_coutl.pdf
    • https://uploads.strikinglycdn.com/files/96995dd7-e955-4337-8410-38db5f046481/fujipo.pdf
    • https://static1.squarespace.com/static/5fce945af2374f0e5acc2913/t/5fd708c9154d7278710343a3/1607928010387/ieee_test_plan_template.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_off0000cd72.bin
cd6a8250afeec283b792b4b35c7ebca6ece1e05ee67889d6deda394f094c8002		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD72 5052 bytes
font_01_sfnt_off0000deaa.bin
2553391cbc08c2f3d4097462b418c24fe0e764135076a54442044b6dc1d408c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAA 10168 bytes

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