Malicious PDF — malware analysis report

Static analysis result for SHA-256 5caf6a1e36d5c4ed…

MALICIOUS

PDF

17.4 KB Created: 2019-04-30 02:25:17 +01:00 Authoring application: mPDF 5.7
MD5: 0b29d54987d18ef2c8c2ff56f0698b18 SHA-1: b71e5d4c7a2e080d888e7e84ea7fb3edb9a1fa4c SHA-256: 5caf6a1e36d5c4ed5e44edd9d2d9a5a26c009fae0e352442e026f7d227753aee
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, identified as a link farm. While the URLs themselves are currently classified as benign, the sheer volume and the heuristic firing of PDF_SEO_LINK_FARM suggest a malicious intent, likely to direct users to potentially harmful content or for SEO manipulation. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the structure implies an attempt to leverage external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

Heuristics 2

  • 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 http://loaminoo.linkpc.net/4097097090090094/Hot-Pursuit-Romantic-Suspense-4-5-by-Karen-Rose.pdf
    • http://loaminoo.linkpc.net/3099094093095096/Have-You-Seen-Her-Romantic-Suspense-2-by-Karen-Rose.pdf
    • http://loaminoo.linkpc.net/1092091096097/Have-You-Seen-Her-Romantic-Suspense-2-by-Karen-Rose.pdf
    • http://loaminoo.linkpc.net/4099093097090099/I-Can-See-You-Romantic-Suspense-10-Minneapolis-1-by-Karen-Rose.pdf
    • http://loaminoo.linkpc.net/3099094090095099/Count-to-Ten-Romantic-Suspense-6-Chicago-5-by-Karen-Rose.pdf
    • http://loaminoo.linkpc.net/2097093092090099/You-Belong-to-Me-Romantic-Suspense-12-Baltimore-1-by-Karen-Rose.pdf
    • http://loaminoo.linkpc.net/3096095096091093/I-m-Watching-You-Romantic-Suspense-3-Chicago-2-by-Karen-Rose.pdf
    • http://loaminoo.linkpc.net/1091090091093/Silent-Scream-Romantic-Suspense-11-Minneapolis-2-by-Karen-Rose.pdf
    • http://loaminoo.linkpc.net/2098094097091090/Silent-Scream-Romantic-Suspense-11-Minneapolis-2-by-Karen-Rose.pdf
    • http://loaminoo.linkpc.net/4095091093096098/Watch-Your-Back-Romantic-Suspense-15-Baltimore-4-by-Karen-Rose.pdf
    • http://loaminoo.linkpc.net/1091097094090094093/Karen-Rose-Books-2017-Checklist-Reading-Order-of-Baltimore-Series-Chicago-Series-Cincinnati-Series-Daniel-Vartanian-Series-Romantic-Suspense-Series-and-List-of-All-Karen-Rose-Books-by-Series-List.pdf
    • http://loaminoo.linkpc.net/4098091099090094/Wanting-PAVAD-FBI-Romantic-Suspense-2-by-Calle-J-Brookes.pdf
    • http://loaminoo.linkpc.net/3098093092096090/Watching-PAVAD-FBI-Romantic-Suspense-1-by-Calle-J-Brookes.pdf
    • http://loaminoo.linkpc.net/4098092095095092/Running-PAVAD-FBI-Romantic-Suspense-6-by-Calle-J-Brookes.pdf
    • http://loaminoo.linkpc.net/1091097097091092097/Dangerous-Desires-A-Romantic-Suspense-Collection-by-Tia-Siren.pdf
    • http://loaminoo.linkpc.net/4091092096091099/Dangerous-Dozen-Romantic-Suspense-Boxed-Set-by-Charity-Pineiro.pdf
    • http://loaminoo.linkpc.net/1098098096096091/When-Darkness-Comes-A-Haunting-Romantic-Suspense-Thriller-by-Sandra-Ross.pdf
    • http://loaminoo.linkpc.net/2095097099096093/Dangerous-Attraction-Romantic-Suspense-Boxed-Set-by-Kaylea-Cross.pdf
    • http://loaminoo.linkpc.net/5099090096093099/Criminal-Deception-Silhouette-Romantic-Suspense-1591-by-Marilyn-Pappano.pdf
    • http://loaminoo.linkpc.net/1094095099097097/One-Cool-Lawman-Silhouette-Romantic-Suspense-1466-by-Diane-Pershing.pdf