Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff122af4a8033c77…

MALICIOUS

PDF

58.7 KB Created: 2020-09-20 04:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e37ad2058350b763f8f6a74b7bcbd1cd SHA-1: bae4a4e4835daf4c4fb39ea8da4c4209d77380b3 SHA-256: ff122af4a8033c772b9a8753dd3a21b15e7f1db5b4f2a9f60ca55131fde3221e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure related to a game, and the primary URL is associated with a malicious redirector. The ML classifier also strongly indicated maliciousness.

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.link/wix?keyword=goblin+king+pathfinder+kingmaker
    • http://files.hebraicbeliever.com/uploads/1/3/0/8/130813643/581684.pdf
    • http://files.eliasonfoundation.org/uploads/1/3/1/3/131379181/a86525605d.pdf
    • http://bowew.lgbtwalco.org/uploads/1/3/1/4/131453134/47823f.pdf
    • http://gasadal.socialworkfootprints.org/uploads/1/3/1/6/131606113/fb8b4102e.pdf
    • https://7edcf28e-383a-40a3-95a3-f24406e2fce3.filesusr.com/ugd/b0cd75_1dad012a58624be4b0646cb0c7026053.pdf?index=true
    • https://606bc560-44e5-46ef-9aae-c3ea57634827.filesusr.com/ugd/5438e3_c59d5cc095dd45749a7462434b05eea4.pdf?index=true
    • https://bdaced34-6e09-4295-a41a-d5feeda7160a.filesusr.com/ugd/d31907_6c24da1cf42943978dd76e223199bd6e.pdf?index=true
    • https://29f4a004-bad5-4650-b77e-c42dbe8177b9.filesusr.com/ugd/904a8b_b8418f1a79aa4bbcaab5f946afdb2d7a.pdf?index=true
    • https://f2783bf1-b640-4534-9350-24ce8f518e66.filesusr.com/ugd/21a131_f73ef547f398462b9f80139b1999b971.pdf?index=true
    • https://3a199c54-afdc-4d94-a24b-a381dad6d680.filesusr.com/ugd/8a5fcf_479454dc1e144a218fdbfa4bafbe268a.pdf?index=true
    • https://845d74a1-3999-4da8-a777-e22f9ab80530.filesusr.com/ugd/b4f0c6_e87d9638f3ff47d2a22ca7c406a2b69e.pdf?index=true
    • https://44032c82-0a6b-4b44-91de-bf640edad03d.filesusr.com/ugd/81d6a4_ccaa5f48edcc480297f08b0d74bfa12c.pdf?index=true
    • https://621e49a7-63c1-4095-bacc-cc5f452b4e64.filesusr.com/ugd/8e1900_1473583a65394b08bd69026225101b7f.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_off00009aec.bin
af23d4f057ad9362fed6b0b3fb212b93e69aa01b8a4036ddf46871b29ae4edf2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AEC 5300 bytes
font_01_sfnt_off0000acbf.bin
2522a010fbefd293485887d51c25a94203f7687429c4892219f2c46c42493324		 pdf-font-stream PDF embedded font (sfnt) at offset 0xACBF 10404 bytes
font_02_sfnt_off0000d037.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD037 4324 bytes

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