Malicious PDF — malware analysis report

Static analysis result for SHA-256 c08ab990da3b1663…

MALICIOUS

PDF

41.3 KB Created: 2020-09-20 03:31:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f609232cf1507469204f7a8d9f9767e SHA-1: 25522634a936cbf28c12e3843d9839ab38cb9fae SHA-256: c08ab990da3b1663f84f37d120c0f767eeeed49c385e953b91fb42f908aa6cd3
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.club/wix?keyword=eso+woodworking+guide', which is also flagged as a malicious redirector. This suggests the primary purpose is to redirect the user to malicious infrastructure, likely for further exploitation or credential harvesting. The ML classifier strongly supports the malicious nature of this PDF.

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=eso+woodworking+guide
    • http://wetajovod.rawseries.org/uploads/1/3/0/8/130873851/2908543.pdf
    • http://vuwore.billyburkefans.com/uploads/1/3/0/7/130739069/nonomurafej.pdf
    • http://files.myshoedestination.com/uploads/1/3/0/7/130740017/8912511.pdf
    • http://files.tranbcreative.com/uploads/1/3/2/7/132740498/8280803c27.pdf
    • https://cdn.shopify.com/s/files/1/0432/0067/5995/files/research_methodology_cr_kothari.pdf
    • https://cdn.shopify.com/s/files/1/0429/5363/8044/files/14125764324.pdf
    • https://cdn.shopify.com/s/files/1/0427/7148/0742/files/sujomojawefeganaxiw.pdf
    • https://cdn.shopify.com/s/files/1/0438/6321/2192/files/11504913894.pdf
    • https://cdn.shopify.com/s/files/1/0479/8300/1756/files/epic_war_tower_defense_2_apk.pdf
    • https://edea66ed-3f3b-42f8-abf6-51b1355089bf.filesusr.com/ugd/bae363_4806650e77594deab30134508c4d2388.pdf?index=true
    • https://3bceed65-4c7c-49b2-80f1-6d48a0b92400.filesusr.com/ugd/fdd6c2_68d2901378904b2d9c2f6f6c26a292ed.pdf?index=true
    • https://c0999f81-4cda-4a8c-9df7-4dc62b7b09f0.filesusr.com/ugd/a474dd_35d5f13ede214935a2de2f5346986216.pdf?index=true
    • https://63adb2c0-c01d-4fb8-a4b8-954b45d0d678.filesusr.com/ugd/895bef_b04b0e45b9df43138b6eb8a8adea63a1.pdf?index=true
    • https://7772ce1c-b538-417f-aaf5-5c1e783403f9.filesusr.com/ugd/1a1092_c8ff789c05314c06841a438dccf44d6a.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064b7.bin
32bc2399b6729ec80b001fbd8de3e505eb445bb8730c9ace62515186eac4094b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64B7 4864 bytes
font_01_sfnt_off0000756f.bin
dd5e7c2ac2264f71dd1c98c83baa75449845e9e7d74e2354b431f14704da1c63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x756F 10320 bytes

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