Malicious PDF — malware analysis report

Static analysis result for SHA-256 29ef246fb986cd09…

MALICIOUS

PDF

50.1 KB Created: 2020-08-15 00:17:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 308902b4503fc292aaf7a6367fc0ae66 SHA-1: 0546af0ad0bdff10534f30dd0322ee40b902d8fa SHA-256: 29ef246fb986cd098d11ecd18e5ab83e46328f60aaa447a6aa0d295e81b938d4
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wb?keyword=letscom%20fitness%20tracker%20ip67%20user%20manual'. This URL is embedded within the document body, which also contains numerous other links, many pointing to Shopify domains, suggesting a link farm or SEO poisoning tactic. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector appears to be social engineering via a deceptive link.

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/wb?keyword=letscom%20fitness%20tracker%20ip67%20user%20manual
    • http://files.jaztalks.com/uploads/1/3/2/7/132712129/04774d0f8.pdf
    • https://cdn.shopify.com/s/files/1/0431/5335/9005/files/list_of_anticancer_drugs.pdf
    • https://cdn.shopify.com/s/files/1/0432/8305/4757/files/85157201107.pdf
    • https://cdn.shopify.com/s/files/1/0435/2629/1611/files/award_template_blank.pdf
    • https://cdn.shopify.com/s/files/1/0439/3995/4856/files/89332451169.pdf
    • https://cdn.shopify.com/s/files/1/0437/2388/2650/files/lobster_tail_carlo_s_bakery.pdf
    • https://cdn.shopify.com/s/files/1/0454/8486/7736/files/50871396235.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wetitoditasenubekuxon.pdf
    • https://cdn.shopify.com/s/files/1/0428/7329/0908/files/51239180350.pdf
    • https://cdn.shopify.com/s/files/1/0429/9417/2058/files/75455468633.pdf
    • https://cdn.shopify.com/s/files/1/0429/8155/6375/files/auto_mechanics_and_auto_electrical.pdf
    • https://cdn.shopify.com/s/files/1/0433/3748/2405/files/25400879723.pdf
    • https://cdn.shopify.com/s/files/1/0434/4581/3413/files/57553928401.pdf
    • https://cdn.shopify.com/s/files/1/0433/7877/0085/files/bejeweled_3_online_free_game_no.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007b31.bin
4aba2bb845853324476be69e5ed1bf4ff35002942389efac2b843cac1129f0e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B31 2828 bytes
font_01_sfnt_off0000852c.bin
b1caece90fbdef305859e916cd90639ed8bb3d976f1269e13f8975f5a559ad38		 pdf-font-stream PDF embedded font (sfnt) at offset 0x852C 5400 bytes
font_02_sfnt_off0000977e.bin
67ca7da2d87eb8ab4b654f0e8b93c890f69f4142f5206e5fc67b7c3e43e7063d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x977E 9828 bytes

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