Malicious PDF — malware analysis report

Static analysis result for SHA-256 a178f6c875714c7f…

MALICIOUS

PDF

67.2 KB Created: 2020-08-05 02:55:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee1966e438e3225cafc511c573954f98 SHA-1: 6c06d4364c09902475b487af1fa777ab46a05662 SHA-256: a178f6c875714c7fe3732e11a752d61f2bee30327151f074ac7e1ed8fa6c35d1
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Add-Override T1059.001 PowerShell

The PDF contains a mass of external links, many of which point to a redirector infrastructure. The primary malicious link, https://ttraff.ru/pify?keyword=phenolic+compounds+book+pdf, is identified as a known malicious redirector. The document body, though heavily obfuscated, contains references to the book title and the malicious URL, suggesting a lure to download content that ultimately leads to malicious infrastructure. No scripts were extracted, but the PDF structure and embedded links strongly indicate a malicious redirection campaign.

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=phenolic+compounds+book+pdf
    • http://files.alex-key.com/uploads/1/3/1/8/131857315/taruvavaforubi-kabilegu.pdf
    • http://dizek.muttleyfarms.org/uploads/1/3/1/4/131453540/631550.pdf
    • http://files.valleyrootsfoodhub.com/uploads/1/3/0/7/130740344/fa8b50ce.pdf
    • http://files.michellestockdale.com/uploads/1/3/1/4/131406369/fakemofirizopuwagok.pdf
    • http://files.fittsmath.com/uploads/1/3/2/6/132680808/zarafi.pdf
    • https://cdn.shopify.com/s/files/1/0437/6946/2935/files/xukize.pdf
    • https://cdn.shopify.com/s/files/1/0435/9100/8418/files/55836610256.pdf
    • https://cdn.shopify.com/s/files/1/0435/8003/1137/files/data_structures_and_algorithms_in_c_tutorials_point.pdf
    • https://cdn.shopify.com/s/files/1/0430/3775/3501/files/95738193338.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wixet.pdf
    • https://cdn.shopify.com/s/files/1/0440/6480/0918/files/wilurusipunofamewufesit.pdf
    • https://cdn.shopify.com/s/files/1/0435/3314/0127/files/13835304037.pdf
    • https://cdn.shopify.com/s/files/1/0441/2253/8136/files/china_s_war_with_vietnam_1979_issues_decisions_and_implications.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/87277754858.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57355052908.pdf
    • https://cdn.shopify.com/s/files/1/0434/7301/0845/files/fekarulanasilegezer.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_off0000caf4.bin
ed762d6025243b895e683e5f22a745791777d416a2608490d306bdaa45e7c845		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF4 5296 bytes
font_01_sfnt_off0000dcd3.bin
2a203df6f8ad8cb1ab3951da4e13a71617a38f4e58be43483009ece32103590e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD3 10208 bytes

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