Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3da6ed2feca538a…

MALICIOUS

PDF

64.9 KB Created: 2020-08-29 00:41:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc6a6f45fa9c1a8949032c5741b7c5a4 SHA-1: 0848fc6c6df1085aa7f3b4da7d0de7eb0d78a141 SHA-256: c3da6ed2feca538a91c9f19f140ca6e0e69bba9eba7d124b1d3c96c4ffeba3ad
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=all+new+faded+for+her+bug'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, including 'https://cdn.shopify.com/s/files/1/0428/9835/8432/files/581871399.pdf'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL.

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/wix?keyword=all+new+faded+for+her+bug
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/581871399.pdf
    • https://cdn.shopify.com/s/files/1/0430/7881/1797/files/67641826839.pdf
    • https://cdn.shopify.com/s/files/1/0437/8502/7745/files/upsssc_tubewell_operator_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0428/8839/6959/files/kiloniwurorisukefipulada.pdf
    • https://static.usrfiles.com/ugd/b8c837_0c9d57dcd7644dde94f476682f9c551f.pdf
    • https://static.usrfiles.com/ugd/b8c837_6b93a5aa4ae34d488520c5d7e24e6090.pdf
    • https://static.usrfiles.com/ugd/b8c837_c37b508b33804118a6a1ab87f195e5c6.pdf
    • https://cdn.shopify.com/s/files/1/0430/6858/8185/files/temifibofitadum.pdf
    • https://cdn.shopify.com/s/files/1/0431/7567/4014/files/cuanto_es_5_10_en_metros.pdf
    • https://cdn.shopify.com/s/files/1/0431/7147/9713/files/moving_templates_for_powerpoint_free.pdf
    • https://cdn.shopify.com/s/files/1/0435/1324/9944/files/32972321487.pdf
    • https://static.usrfiles.com/ugd/b8c837_ec1581671e9f4cbabdd2bf6ea3278440.pdf
    • https://static.usrfiles.com/ugd/b8c837_85dec416757f4ded8f25e79c224fa635.pdf
    • https://static.usrfiles.com/ugd/b8c837_cdcc5e5dc1f647eaa89e30c9f4d76541.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_off0000c0b9.bin
e0da4ddd9be17eac6210bd585c23ec7d10616f6cb145478733edfa5cade9a301
pdf-font-stream PDF embedded font (sfnt) at offset 0xC0B9 5212 bytes
font_01_sfnt_off0000d280.bin
8417030ea40f1528e28090013709f5679223e8e4daf70e87f5c814528c44ffdd
pdf-font-stream PDF embedded font (sfnt) at offset 0xD280 10600 bytes