Malicious PDF — malware analysis report

Static analysis result for SHA-256 990abe32a49aaee9…

MALICIOUS

PDF

39.9 KB Created: 2020-08-12 00:56:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24691350531ac5f5e26cbb8fd76ec309 SHA-1: 433933b265e78de09a83cf7d3f5378cfa5e78df3 SHA-256: 990abe32a49aaee93bdd5bfcb6f7ade42284748cb03dfa225695ff1b9444ed89
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, pointing to ttraff.com. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on Shopify. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the target URL, suggesting a lure to a malicious site disguised as an audit report.

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/pify?keyword=independent+audit+report+sample+pdf
    • http://bedabi.believenufitness.com/uploads/1/3/1/0/131071157/fapazaxur-wabujuvi.pdf
    • http://files.puzzledog.ca/uploads/1/3/1/4/131453194/4541093.pdf
    • http://files.greenvillechoralsociety.com/uploads/1/3/0/9/130969166/8107224.pdf
    • https://cdn.shopify.com/s/files/1/0434/6429/4557/files/35296413186.pdf
    • https://cdn.shopify.com/s/files/1/0432/1827/2423/files/87795054919.pdf
    • https://cdn.shopify.com/s/files/1/0449/6778/8712/files/antrenmanlarla_matematik_2_zml.pdf
    • https://cdn.shopify.com/s/files/1/0431/9451/5614/files/fujiwuwisuzutibal.pdf
    • https://cdn.shopify.com/s/files/1/0430/7596/0985/files/32110631217.pdf
    • https://cdn.shopify.com/s/files/1/0435/7079/0558/files/xolobe.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/21659337375.pdf
    • https://cdn.shopify.com/s/files/1/0438/4410/8453/files/automated_irrigation_system_project.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/41718344304.pdf
    • https://cdn.shopify.com/s/files/1/0430/7314/2933/files/2008_vw_eos_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/5883/0229/files/what_is_a_full_house_in_yahtzee.pdf
    • https://cdn.shopify.com/s/files/1/0429/6402/5493/files/93804861011.pdf
    • https://cdn.shopify.com/s/files/1/0429/1382/4927/files/gars-_3_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/6934/8763/files/canterville_ghost_chapter_wise_summary.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_off0000618e.bin
2e8462a127fc3b6a187ae1eeb81d3e34c2a04a66a23c689481a5885bd2f1dcd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x618E 5124 bytes
font_01_sfnt_off000072da.bin
04a37d474c61e72ee68c327d557aef2241a19b013e51bbb089f4210a022077f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72DA 9280 bytes

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