Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb7b022989886877…

MALICIOUS

PDF

51.2 KB Created: 2020-08-19 03:26:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 326ca3a44a8d84010ebf19026ee39672 SHA-1: 1eceb1d38fa5e7eca0cb892f3031a10297d5c80f SHA-256: fb7b02298988687780b6da8e0ae42277c59eba373b9255a09dfc7c0d432fdbcc
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK pointing to ttraff.ru. The document body, though heavily obfuscated, contains text related to 'danny boy piano sheet music' and references wkhtmltopdf, suggesting a lure. The presence of many Shopify links, while some are benign, indicates a potential link farm used for SEO poisoning or to obscure the malicious redirector. The ML classifier also strongly flagged this PDF as malicious.

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/pify?keyword=danny+boy+piano+sheet+music
    • http://puvisexu.fungusfanaticus.com/uploads/1/3/1/8/131871721/konepidubuval_mevonorikinuv.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/51031200676.pdf
    • https://cdn.shopify.com/s/files/1/0431/8406/2622/files/case_files_pediatrics_google_drive.pdf
    • https://cdn.shopify.com/s/files/1/0434/3041/2454/files/29419398960.pdf
    • https://cdn.shopify.com/s/files/1/0431/0741/8273/files/73788351115.pdf
    • https://cdn.shopify.com/s/files/1/0438/2598/7734/files/40301315536.pdf
    • https://cdn.shopify.com/s/files/1/0437/5930/4858/files/modetifaguz.pdf
    • https://cdn.shopify.com/s/files/1/0433/5288/3352/files/70083284666.pdf
    • https://cdn.shopify.com/s/files/1/0431/1567/5809/files/retib.pdf
    • https://cdn.shopify.com/s/files/1/0438/0835/8561/files/osha_30_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xasojikunu.pdf
    • https://cdn.shopify.com/s/files/1/0427/6856/4380/files/compaction_grouting_consensus_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/6935/8758/files/vocabulary_for_ielts_advanced_audio_free.pdf
    • https://cdn.shopify.com/s/files/1/0435/8694/5187/files/tanatologia_geriatria.pdf
    • https://cdn.shopify.com/s/files/1/0429/3174/9031/files/23403667575.pdf
    • https://cdn.shopify.com/s/files/1/0439/2134/2619/files/57217745109.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_off00006578.bin
7c393ad237248f186b24fbf53fc557d5cee18ab42390d4e977e34dff1fb9f9db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6578 5288 bytes
font_01_sfnt_off00007752.bin
9bc5368e6f8bb997e2796bf17a22f88085e70f642def3483ce26f61900b6c0cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7752 16052 bytes
font_02_sfnt_off0000a943.bin
20dc835fdb26e5c8b2bf371a74de3f1f2251d0d540cd54084ecb3d27d8cc4587		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA943 16076 bytes

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