Malicious PDF — malware analysis report

Static analysis result for SHA-256 02663c64035e3da4…

MALICIOUS

PDF

35.7 KB Created: 2020-08-01 12:29:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3abac6b49671230ca6e926d66c565fc SHA-1: 495624f2aee57113b0c84f042c8838b658e5db14 SHA-256: 02663c64035e3da42b03c7c778f89cb418e356eaa7fb6182e08793b26646a56d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector infrastructure. The heuristic firings indicate this PDF is designed to link to a large number of external PDF files, likely to manipulate search engine results or distribute malicious content. The ML classifier strongly flagged this sample as malicious, supporting the conclusion that the embedded links are intended for malicious purposes.

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=padi+adventures+in+diving+manual+pdf
    • http://files.sakonnetlighthouse.org/uploads/1/3/2/7/132712119/wotogegowuzepoxomen.pdf
    • http://files.dhi-nc.com/uploads/1/3/2/7/132712306/c2ba1c74fb2d.pdf
    • http://files.nkyyoungmarines.com/uploads/1/3/1/0/131070911/68766b.pdf
    • http://files.corpsefeed.com/uploads/1/3/2/7/132741571/sajumires.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/8220/3811/files/60490475252.pdf
    • https://cdn.shopify.com/s/files/1/0430/1671/6437/files/zowodajaniwiveri.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/97428896976.pdf
    • https://cdn.shopify.com/s/files/1/0432/7764/8027/files/phillipino_baby_names.pdf
    • https://cdn.shopify.com/s/files/1/0435/4929/4756/files/movod.pdf
    • https://cdn.shopify.com/s/files/1/0429/8627/4967/files/85848992831.pdf
    • https://cdn.shopify.com/s/files/1/0431/7426/4996/files/zobukexoxupufo.pdf
    • https://cdn.shopify.com/s/files/1/0429/4311/9527/files/widapokarateli.pdf
    • https://cdn.shopify.com/s/files/1/0440/8508/4310/files/11445335029.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/podufa.pdf
    • https://cdn.shopify.com/s/files/1/0430/9054/2743/files/50577935280.pdf
    • https://cdn.shopify.com/s/files/1/0433/8896/0919/files/28147319021.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_off00004dd9.bin
66dc15f28a99ce20b911ef424baf90ebd9fe301e95c303827192a2c1bd11e066
pdf-font-stream PDF embedded font (sfnt) at offset 0x4DD9 5424 bytes
font_01_sfnt_off0000603e.bin
06727aba40b6818ad97de540f93b0570f5245c134bb7da6ecfa70121ff571607
pdf-font-stream PDF embedded font (sfnt) at offset 0x603E 9924 bytes