Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0ef26c7707686e4…

MALICIOUS

PDF

41.7 KB Created: 2020-10-17 02:43:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aaa6a3418f0054517169857eba2c1c83 SHA-1: 45062ed64bb18f871b702731a2567ccf92f3db0b SHA-256: f0ef26c7707686e4c050b549ac0fa8da10c38015a494c6fc5ac677dfe275ce71
150 Risk Score

Malware Insights

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

The PDF contains a mass of external links, with one prominent link pointing to a redirector known to host malicious content. The document body, though heavily obfuscated, contains text related to Android errors and includes the malicious URL, suggesting a lure for users searching for technical solutions. The presence of numerous Weebly-hosted PDF links indicates a link farm SEO strategy to improve search engine ranking for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.me/123?keyword=android+recovery+mode+error+screen
    • https://digonowokeke.weebly.com/uploads/1/3/1/8/131856318/xasarerajuged.pdf
    • https://xumabilere.weebly.com/uploads/1/3/1/1/131163638/dojigedijiresi_degakasara.pdf
    • https://nikokabiliru.weebly.com/uploads/1/3/1/4/131409463/ec649c376a6cdbb.pdf
    • https://vogizezadu.weebly.com/uploads/1/3/0/8/130814341/ligufavasoriru.pdf
    • https://fisotewefupug.weebly.com/uploads/1/3/1/0/131071176/topixovenojosan_supebo_xekafimeb_nilujam.pdf
    • https://cdn-cms.f-static.net/uploads/4365634/normal_5f8926e974f57.pdf
    • https://cdn-cms.f-static.net/uploads/4375083/normal_5f8a26c24fdf0.pdf
    • https://cdn-cms.f-static.net/uploads/4369494/normal_5f87eaedbfa56.pdf
    • https://cdn-cms.f-static.net/uploads/4369174/normal_5f8a1a1b5c664.pdf
    • https://cdn-cms.f-static.net/uploads/4366311/normal_5f888065c2aee.pdf
    • https://cdn-cms.f-static.net/uploads/4368735/normal_5f87fbd8ee15c.pdf
    • https://cdn-cms.f-static.net/uploads/4370555/normal_5f89853c96cbe.pdf
    • https://uploads.strikinglycdn.com/files/0591db2c-1a64-4f72-97ca-126f3841a1d4/95882520475.pdf
    • https://uploads.strikinglycdn.com/files/90ed4b98-840c-472a-b98e-141d4c770fc1/4323416771.pdf
    • https://uploads.strikinglycdn.com/files/577d5082-6858-4f56-8c44-0f1451ba0936/98328105188.pdf
    • https://cdn.shopify.com/s/files/1/0471/0678/5430/files/20193923012.pdf
    • https://cdn.shopify.com/s/files/1/0484/8546/6267/files/22535769406.pdf
    • https://uploads.strikinglycdn.com/files/73fed094-40f4-42cd-9066-e48b19f1fd48/nezapitibupugefumir.pdf
    • https://uploads.strikinglycdn.com/files/b9f2f8bc-febe-4a47-9c63-35105645e828/gesotovilil.pdf
    • https://uploads.strikinglycdn.com/files/430ad026-39b0-4aa6-b0b9-22d6c8019297/20077288890.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_off000065be.bin
bed6450225fbfb0782d0199b5120bbe51d2428364baa947506f8098f996ce97b
pdf-font-stream PDF embedded font (sfnt) at offset 0x65BE 4992 bytes
font_01_sfnt_off000076ab.bin
6477623be77c530d3bea16600f88427221862b2a42ffb8d17fd4e2ff50c508cd
pdf-font-stream PDF embedded font (sfnt) at offset 0x76AB 10352 bytes