Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1ad53f22e81e8eb…

MALICIOUS

PDF

64.3 KB Created: 2020-08-31 00:19:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f80ee4c3b9e4abb183daf885c3c5d4f9 SHA-1: 75f535f635d734c96fafdf8c399c6e21d9b9e9c3 SHA-256: a1ad53f22e81e8eb2d2a5cae046ab23c3bf5ebfe0af69ae83562707e76ad1414
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. The presence of a link farm suggests an attempt to manipulate search engine results or distribute content through numerous seemingly benign links, with at least one leading to malicious activity.

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/wix?keyword=6.5+grendel+reloading+handbook+volume+2
    • https://cdn.shopify.com/s/files/1/0430/0144/6554/files/crappie_fishing_report_sardis_lake_ms.pdf
    • https://cdn.shopify.com/s/files/1/0430/5072/9634/files/tebomega.pdf
    • https://cdn.shopify.com/s/files/1/0447/6986/9975/files/earth_porn_reddit.pdf
    • https://cdn.shopify.com/s/files/1/0435/3366/4420/files/broadcasting_equipment.pdf
    • https://cdn.shopify.com/s/files/1/0435/3989/0327/files/17311991663.pdf
    • https://static.usrfiles.com/ugd/d78803_7cb0e9dc041145bb83eb69fcef2a4161.pdf
    • https://static.usrfiles.com/ugd/b8c837_e3a2922c4e134e8986225f52af941c85.pdf
    • https://static.usrfiles.com/ugd/b8c837_9ff3a7138cc3429ea17e92826c9049c5.pdf
    • https://static.usrfiles.com/ugd/89064d_e5217a41c708412daf97e55049d39435.pdf
    • https://static.usrfiles.com/ugd/5438e3_b7ed17f5b6c24851923b7dcfe117dcd4.pdf
    • https://static.usrfiles.com/ugd/cec570_c6cdfe773182431da1fef807b961f98f.pdf
    • https://static.usrfiles.com/ugd/760101_2f4f300dbbe74a7db9b972796bfeaa5b.pdf
    • https://static.usrfiles.com/ugd/daca0d_659b19b148fd4cbcaccfa5a90b2d9bf9.pdf
    • https://static.usrfiles.com/ugd/455f95_0751951fd6444aa2bd7a52139998de7a.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_off0000a6b5.bin
04c0b2a26eac49199621caff00af2f5f07667fd393f43018fbd9dca2e40eb70f
pdf-font-stream PDF embedded font (sfnt) at offset 0xA6B5 5672 bytes
font_01_sfnt_off0000b9cf.bin
b05bc1a7553a895c4dd71d0d362aa99ab978a265c773783dc2730495bced5fbd
pdf-font-stream PDF embedded font (sfnt) at offset 0xB9CF 10920 bytes
font_02_sfnt_off0000dee5.bin
84d5bd19c210eb3b73ecc14096ab1e56fdfb5b80ce7ba4f0052c67c0c2b02727
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE5 16060 bytes