Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ab508548516d2bc…

MALICIOUS

PDF

41.9 KB Created: 2020-08-31 23:09:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4a006b6d3656518234b41b1587111c5 SHA-1: f1da88c9e3046fc3bd7c5df27f859e2903ee1584 SHA-256: 3ab508548516d2bc011ae70d79e87d606d0b9c397d17e123697a9de5f2a55707
154 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, which points to 'ttraff.club'. This URL is presented in the document body alongside a keyword suggesting a lure for the 'Audible app for windows'. The PDF also exhibits characteristics of a link farm, with numerous embedded links to Shopify-hosted PDFs. The ML classifier strongly indicates maliciousness. The primary attack pattern involves redirecting the user to malicious infrastructure.

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=audible+app+for+windows
    • https://cdn.shopify.com/s/files/1/0439/3949/6094/files/69663708273.pdf
    • https://cdn.shopify.com/s/files/1/0434/5892/0605/files/hotel_asset_management_principles_and_practices_3rd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0433/7762/3201/files/oxford_sweat_equity_program.pdf
    • https://cdn.shopify.com/s/files/1/0436/8121/8710/files/aga_khan_hospital_medical_reports.pdf
    • https://cdn.shopify.com/s/files/1/0427/9812/1119/files/98866003335.pdf
    • https://cdn.shopify.com/s/files/1/0432/5956/0086/files/rupojonone.pdf
    • https://cdn.shopify.com/s/files/1/0428/5680/8607/files/67312189849.pdf
    • https://cdn.shopify.com/s/files/1/0429/5373/6351/files/83943830522.pdf
    • https://cdn.shopify.com/s/files/1/0436/9675/0742/files/adenocarcinoma_de_pancreas.pdf
    • https://cdn.shopify.com/s/files/1/0431/0063/5290/files/cherry_wine_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0434/5859/2934/files/tactics_for_toeic_test_1.pdf
    • https://cdn.shopify.com/s/files/1/0429/5757/0207/files/91425738339.pdf
    • https://cdn.shopify.com/s/files/1/0429/9315/6259/files/81960819080.pdf
    • https://cdn.shopify.com/s/files/1/0436/3635/9326/files/vikovuxolozixeme.pdf
    • https://cdn.shopify.com/s/files/1/0433/7162/6652/files/24686314819.pdf
    • https://cdn.shopify.com/s/files/1/0438/2916/6242/files/collected_tide_bloom_honey_wow.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_off00006691.bin
5ab5c9d5b7ad142ea42f6440895010b0c15c6e9b6e7d8b415bccc5d6f2655a26		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6691 5256 bytes
font_01_sfnt_off00007890.bin
4c43b294b60ac409d813c02f626bd67a6225fce69d6aee46b1a4d79b925d94eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7890 10144 bytes

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