Malicious PDF — malware analysis report

Static analysis result for SHA-256 075439858c492fe9…

MALICIOUS

PDF

53.2 KB Created: 2020-08-12 22:03:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b6c24e3a8195e89c20a5e629d4a52d20 SHA-1: 2573bc0e915cbdf97d6324c17262c54ef245cc29 SHA-256: 075439858c492fe9051b35bfdbd305fc2d0896317d6e750656ace214e93887a1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, with a critical heuristic firing for linking to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'thermocouple calibration pdf' and includes the malicious URL. The presence of many external links suggests an attempt to manipulate search engine results or direct users to malicious sites.

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=thermocouple+calibration+pdf
    • http://files.oakcreekzc.org/uploads/1/3/1/6/131636769/645e755caeb41.pdf
    • http://files.liminalstudies.com/uploads/1/3/2/8/132814050/47eb6c86882ed8.pdf
    • http://files.fitupfabrication.com/uploads/1/3/1/4/131453706/9586067.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/6957/0198/files/dagala.pdf
    • https://cdn.shopify.com/s/files/1/0437/8558/4792/files/70542744812.pdf
    • https://cdn.shopify.com/s/files/1/0428/2381/1239/files/79903467494.pdf
    • https://cdn.shopify.com/s/files/1/0427/5830/8006/files/tobarejajibijotob.pdf
    • https://cdn.shopify.com/s/files/1/0434/9735/7472/files/caramelization_reaction.pdf
    • https://cdn.shopify.com/s/files/1/0430/1615/9385/files/34797271072.pdf
    • https://cdn.shopify.com/s/files/1/0434/5597/1492/files/32882087139.pdf
    • https://cdn.shopify.com/s/files/1/0431/6204/2529/files/bevacizumab_side_effects.pdf
    • https://cdn.shopify.com/s/files/1/0440/0742/4158/files/35889342535.pdf
    • https://cdn.shopify.com/s/files/1/0435/2914/2426/files/56422630514.pdf
    • https://cdn.shopify.com/s/files/1/0432/9593/2584/files/69209764289.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009261.bin
b7ddce08933be4b32c0a1f7190c2b8e002bac1154c5356acbb3cc8d41287d978
pdf-font-stream PDF embedded font (sfnt) at offset 0x9261 5308 bytes
font_01_sfnt_off0000a43f.bin
88ed17e0f5b7d900ce6454ec076f187c1474cd66d09e4b87c541265b005e203d
pdf-font-stream PDF embedded font (sfnt) at offset 0xA43F 10424 bytes