Malicious PDF — malware analysis report

Static analysis result for SHA-256 d988662216288118…

MALICIOUS

PDF

38.7 KB Created: 2020-08-16 23:46:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2863d6831210729944085d24e50521f9 SHA-1: 648b84415cf3a42d43ee9446a0c839d179049324 SHA-256: d988662216288118daadf93a791b7aef7ebaa0dd7d55f3473ca3dda44d2865bd
154 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by a machine learning classifier and contains a significant number of embedded links. One critical heuristic identified links pointing to known malicious redirector infrastructure, specifically 'ttraff.cc'. Another heuristic noted a large external PDF link farm, with many links pointing to Shopify domains, likely for SEO manipulation or to obscure the true malicious intent. The document body contains garbled text but also includes the suspicious URL and several benign-looking Shopify URLs, suggesting a lure or distraction.

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=intumescent+foam+sheet
    • http://bomexa.ashmeadcpa.com/uploads/1/3/0/7/130739845/7d126c6dd61.pdf
    • http://vigidewan.darsieandthread.com/uploads/1/3/0/7/130739423/f0a93eba644ba.pdf
    • http://limafeg.hcm3group.com/uploads/1/3/0/7/130775734/wimifopuzosasi.pdf
    • http://gakosuw.jenniferkellett.com/uploads/1/3/1/4/131437756/9321881.pdf
    • https://cdn.shopify.com/s/files/1/0438/2051/5488/files/neural_network_architectures_for_artificial_intelligence.pdf
    • https://cdn.shopify.com/s/files/1/0438/1117/6610/files/mathematics_for_economics_and_finance_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/3492/6495/files/42237909887.pdf
    • https://cdn.shopify.com/s/files/1/0454/3774/7350/files/raladiguropovirigofafojav.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lejozusuxawunulimedobina.pdf
    • https://cdn.shopify.com/s/files/1/0436/3278/7609/files/59214058063.pdf
    • https://cdn.shopify.com/s/files/1/0429/1444/7519/files/acceptance_letter_format.pdf
    • https://cdn.shopify.com/s/files/1/0434/8212/0357/files/99905796059.pdf
    • https://cdn.shopify.com/s/files/1/0433/4705/0661/files/controls_and_variables_spongebob_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0427/4411/9462/files/30902329896.pdf
    • https://cdn.shopify.com/s/files/1/0437/3705/5393/files/mane_injury_report.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_off00005a04.bin
5e879b83a153e62987f5a3395c77c97e7f90ad6d28ba0fd64245ca67cc250279		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A04 4932 bytes
font_01_sfnt_off00006aa1.bin
a1cc420690847b185dee44dc366e1da6d64ddb0cb4694fe5630861426bf57529		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AA1 10428 bytes

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