Malicious PDF — malware analysis report

Static analysis result for SHA-256 87fbbadc4b7703b3…

MALICIOUS

PDF

43.7 KB Created: 2020-09-19 21:40:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f12815ca3a121aedb3dd73e8971ee263 SHA-1: 6d1d9175ccce064eccd043d6750d500abd8553b8 SHA-256: 87fbbadc4b7703b3600f362349d2dfa1926aae3e963a4c256be313830e6f1998
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a high number of embedded links, many of which lead to a redirector service. The ML classifier also strongly indicated maliciousness. The document body contains the URL 'https://ttraff.club/wix?keyword=tl+vs+g2+cs+go', which is also listed as a malicious redirector. This suggests the document is part of a link farm or phishing campaign designed to redirect users to malicious sites.

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.club/wix?keyword=tl+vs+g2+cs+go
    • http://files.netherlands-korea.com/uploads/1/3/2/8/132814182/debisuganakupi-gozanugozulex.pdf
    • http://votivu.australian-spirit.com/uploads/1/3/2/6/132680835/2dfadd8dfe30.pdf
    • https://cdn.shopify.com/s/files/1/0428/4612/6247/files/51045913818.pdf
    • https://cdn.shopify.com/s/files/1/0437/4292/0869/files/antagonistas_colinrgicos.pdf
    • https://cdn.shopify.com/s/files/1/0446/0707/8564/files/dresden_files_rpg_rulebook.pdf
    • https://cdn.shopify.com/s/files/1/0437/6471/1575/files/vidmate_mod_apk_latest.pdf
    • https://cdn.shopify.com/s/files/1/0432/6447/5304/files/celtx_storyboard.pdf
    • https://8939502a-04d0-47ab-b7a7-4fba5382dc49.filesusr.com/ugd/011e4b_984843017a02423bbeec7d2679ea2c05.pdf?index=true
    • https://60822096-3494-4126-b028-2a681f8afa64.filesusr.com/ugd/21a131_5e5562f3e8a04fadaafbae55c96c1f29.pdf?index=true
    • https://b2a687df-f3b3-4d12-8dc2-fb889bf26945.filesusr.com/ugd/8bc2a6_78b50187e2e148e2900d89195e97352e.pdf?index=true
    • https://4a095d5a-59d4-4880-a619-62db5fd6e12a.filesusr.com/ugd/cc03df_65c6f588964f4e229f2b029b94d39271.pdf?index=true
    • https://42a73387-5d5f-4fd3-8373-4b0af33b9038.filesusr.com/ugd/dcbeda_fc6aa5b901214baca46d6ae6f81fbfc4.pdf?index=true
    • https://961d64aa-8af1-441a-945e-6cceefadf66c.filesusr.com/ugd/035627_74d403bf5bb24b9c9cf1ba3a7fc2e7ee.pdf?index=true
    • https://37e36504-55fe-4616-8c90-edd0cadb88d8.filesusr.com/ugd/49f5ef_40990ddb23e74e48a249acf3e3fcd9b2.pdf?index=true
    • https://1a75232a-e6a9-4a0a-a77f-0a23cac09afe.filesusr.com/ugd/c2007e_49600f254cc944968c4e63820f0e0dc5.pdf?index=true
    • https://1d38a0bf-f1ea-43f0-a70b-4b501e75e715.filesusr.com/ugd/12f4eb_4472f1688ae649a9961d6f3db485eacb.pdf?index=true
    • https://058a7a77-6db1-4771-a462-92fd207448d1.filesusr.com/ugd/565485_ec135f0cf81c46f7af722dcff6b63370.pdf?index=true
    • 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_off000061d5.bin
512262fddf796a9e968c77c6e4d78544ca2aa246174e6ab73d6fb3eeb47a7940		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61D5 4240 bytes
font_01_sfnt_off0000703a.bin
f90d470ed9abcccb8eb6522a5ae0376c734938eaea6725f12d0444821c29a131		 pdf-font-stream PDF embedded font (sfnt) at offset 0x703A 10348 bytes
font_02_sfnt_off000093b6.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x93B6 4324 bytes

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