Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c9aa8b15993e95a…

MALICIOUS

PDF

56.0 KB Created: 2020-08-04 22:57:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31a707aeb70e0052db89f19fe55ca544 SHA-1: 365af3ce34ab3bf2238b6e87eaeed10fe1c7379d SHA-256: 4c9aa8b15993e95a94e8c684c56794672799b6285efbe0c3b72796f9bfde5bad
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a critical heuristic indicating it links to known malicious redirector infrastructure. It also contains a large number of external PDF links, suggesting a link farm. The embedded URL 'https://ttraff.cc/pify?keyword=anti+bribery+law+saudi+arabia+pdf' is the primary indicator of malicious intent, likely serving as a lure to a phishing or malware distribution site. The document body contains garbled text and the wkhtmltopdf application name, further supporting its nature as a generated malicious document.

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.cc/pify?keyword=anti+bribery+law+saudi+arabia+pdf
    • http://files.wevalueourteachers.org/uploads/1/3/1/4/131408344/7984176.pdf
    • http://files.nmschoir.com/uploads/1/3/0/8/130813546/8824313.pdf
    • http://files.awanatuhealing.co.za/uploads/1/3/0/7/130776592/8d012cbc.pdf
    • http://files.parklanestablesponyclub.com/uploads/1/3/1/0/131070434/fad7275acc0.pdf
    • http://files.orangehistory.org/uploads/1/3/1/3/131380998/6a7d3c8e67aa6.pdf
    • https://cdn.shopify.com/s/files/1/0433/6392/6174/files/75136372251.pdf
    • https://cdn.shopify.com/s/files/1/0432/2341/6995/files/rafaxeradum.pdf
    • https://cdn.shopify.com/s/files/1/0430/9313/1425/files/togetutagapavarexifoge.pdf
    • https://cdn.shopify.com/s/files/1/0428/9078/9027/files/83170400752.pdf
    • https://cdn.shopify.com/s/files/1/0432/0080/7070/files/baxopusujofe.pdf
    • https://cdn.shopify.com/s/files/1/0437/0271/4533/files/noxazebebut.pdf
    • https://cdn.shopify.com/s/files/1/0429/2771/8567/files/kuzezabumedesokirarekeju.pdf
    • https://cdn.shopify.com/s/files/1/0434/0006/9285/files/18639373627.pdf
    • https://cdn.shopify.com/s/files/1/0432/6844/0232/files/momegopejaferilogexov.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/34680977850.pdf
    • https://cdn.shopify.com/s/files/1/0428/9314/8313/files/34871793090.pdf
    • https://cdn.shopify.com/s/files/1/0431/4238/1725/files/california_residential_purchase_agreement_2017.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_off00008d38.bin
28df880b3d514db74c563ef047303d1fc3929903ed3371bd7c85fa8c39dc1164		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D38 5132 bytes
font_01_sfnt_off00009eb7.bin
cf3ed12f477bf52e750549b53c2a650827999f1bc51cf69a1e7e99558a94086b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9EB7 11648 bytes
font_02_sfnt_off0000c46b.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC46B 4324 bytes

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