Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3ff3063f235b354…

MALICIOUS

PDF

47.8 KB Created: 2020-08-31 18:41:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e8c0b1790a48fbf58ef951edce7ddc4 SHA-1: 16728b193d664ac02bc14691ac2ac09d89f0095a SHA-256: b3ff3063f235b35462c4ff95931658c8d5bcc0d46e48592adea9f4a10787ec35
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic identifying a malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/wix?keyword=dungeon+level+guide+classic+wow', which is flagged as malicious. Another heuristic indicates a PDF link farm, with 'https://cdn.shopify.com/s/files/1/0438/2582/3904/files/cheat_engine_6._1.pdf' being the first URL in this farm. The ML classifier also strongly indicates 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.com/wix?keyword=dungeon+level+guide+classic+wow
    • https://cdn.shopify.com/s/files/1/0438/2582/3904/files/cheat_engine_6._1.pdf
    • https://cdn.shopify.com/s/files/1/0429/4973/8650/files/wrestlemania_33_watch_online.pdf
    • https://cdn.shopify.com/s/files/1/0432/0473/9232/files/mupijesuluf.pdf
    • https://cdn.shopify.com/s/files/1/0431/3215/8116/files/voxezux.pdf
    • https://static.usrfiles.com/ugd/269bb8_b58337032d75499db0f7e6e9f1ca2509.pdf
    • https://static.usrfiles.com/ugd/b8c837_39557059412d42bda1aebf6696bb70ad.pdf
    • https://static.usrfiles.com/ugd/3ceeb9_7c810bdbed154f138b1474a9bf4231ea.pdf
    • https://static.usrfiles.com/ugd/362633_0f921d2057724d20a5483bef9d34318e.pdf
    • https://static.usrfiles.com/ugd/cc03df_d1bb93701e444a0a800e9d0a6890d93f.pdf
    • https://static.usrfiles.com/ugd/b8c837_a322527bd40c4432be99b75aae917238.pdf
    • https://static.usrfiles.com/ugd/12f4eb_3cadc3c939444300b6fc3025233daf42.pdf
    • https://cdn.shopify.com/s/files/1/0431/8684/7903/files/tebaxemozupogenomojidir.pdf
    • https://cdn.shopify.com/s/files/1/0434/6131/2676/files/recetario_de_comida_para_diabeticos.pdf
    • https://cdn.shopify.com/s/files/1/0444/3511/2103/files/animals_worksheet_kindergarten.pdf
    • https://cdn.shopify.com/s/files/1/0429/3056/9382/files/1949734828.pdf
    • https://cdn.shopify.com/s/files/1/0435/5817/4883/files/bevasotazagupireja.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007edc.bin
f982105767dd0e9f8e05dc9f2c43fe2be751cc22866e5b32ace7bcf008ffd445		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EDC 5164 bytes
font_01_sfnt_off00009099.bin
e718f6c0159353339e0b27303615e595315f3d12032f594d936e56a3510fb423		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9099 9864 bytes

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