Malicious PDF — malware analysis report

Static analysis result for SHA-256 380f0a4fb70a2e10…

MALICIOUS

PDF

39.2 KB Created: 2020-08-31 02:23:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d729a5252650eb851939f352e0103721 SHA-1: c2e6dbc1b112c4708b9a39e5a38a1e02ceebda30 SHA-256: 380f0a4fb70a2e10c9398853b5e34a4e9f0c832a7d4d6aab7eabfc2650bc0cb9
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.ru/wix?keyword=lkg+cbse+worksheets+pdf+free'. The document body, though heavily obfuscated, also contains this URL and numerous other links to external PDFs, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves redirecting the user to malicious infrastructure under the guise of providing free educational worksheets.

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.ru/wix?keyword=lkg+cbse+worksheets+pdf+free
    • https://static.usrfiles.com/ugd/b8c837_8c5064a05d2f46b4ac596c50e7c9ba93.pdf
    • https://static.usrfiles.com/ugd/b8c837_042ded1c11234268b377a95cc34b3e07.pdf
    • https://static.usrfiles.com/ugd/b8c837_e43635ec5705449cb025bf6588570ddf.pdf
    • https://static.usrfiles.com/ugd/b8c837_e5ee22d5d4194382b5ba869f65d86ee1.pdf
    • https://cdn.shopify.com/s/files/1/0439/1026/7035/files/lifanatowuxabanusuxu.pdf
    • https://cdn.shopify.com/s/files/1/0428/0349/5071/files/mavikevekunegavinidew.pdf
    • https://cdn.shopify.com/s/files/1/0428/5703/7990/files/godupenavipaputuralozexaf.pdf
    • https://cdn.shopify.com/s/files/1/0432/7296/2203/files/14480395300.pdf
    • https://cdn.shopify.com/s/files/1/0465/0608/2454/files/diary_writing_planning_sheet_ks1.pdf
    • https://cdn.shopify.com/s/files/1/0437/5881/3333/files/26413308435.pdf
    • https://cdn.shopify.com/s/files/1/0449/6785/4248/files/bribery_and_corruption_policy_template.pdf
    • https://cdn.shopify.com/s/files/1/0431/6394/3074/files/nesoravidudenab.pdf
    • https://cdn.shopify.com/s/files/1/0431/8153/9489/files/2926626674.pdf
    • https://cdn.shopify.com/s/files/1/0431/3487/7847/files/21051877299.pdf
    • https://static.usrfiles.com/ugd/b8c837_57315f2387064f5b9116b351a20719dc.pdf
    • https://static.usrfiles.com/ugd/b8c837_20cc7e4667424dc59be3dfd229417251.pdf
    • https://static.usrfiles.com/ugd/b8c837_ffdba306e8c349b2bb3b062d0249fb7e.pdf
    • https://static.usrfiles.com/ugd/c33cdb_0f1bdd67b0a24b258312275fa838be4f.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_off00005c96.bin
b067b130ab8dd64f5fc3d4ca204e86e8af4b87c58cd3339b3afc02b000dfc174		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C96 5412 bytes
font_01_sfnt_off00006f0d.bin
9ea3c5408135337c93362a803e930f15ed9537660d59bd3869c630695afaf5a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F0D 9584 bytes

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