Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8a405e544d827b4…

MALICIOUS

PDF

18.6 KB Created: 2019-04-30 20:14:13 +01:00 Authoring application: mPDF 5.7
MD5: a2ac7eee387a5b7f5cf2de0895e22a38 SHA-1: a27442419b442e8d10232fd23f8b38c735e37999 SHA-256: c8a405e544d827b412e8cdc042bb13118524a7d3b0edd45fbbb83b39edd547ce
90 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, with a heuristic firing indicating a mass of external PDF links. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were extracted, the embedded URLs suggest an attempt to redirect users to potentially harmful content or to establish a presence for further distribution. The primary attack pattern appears to be SEO poisoning or a similar technique to lure users to malicious sites via seemingly legitimate document links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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/3098094092096099/War-Story-The-Classic-True-Story-of-the-First-Generation-of-Green-Berets-by-Jim-Morris.pdf
    • http://loaminoo.linkpc.net/2097099097096094/Burke-amp-Hare-The-True-Story-Story-of-the-Bodysnatchers-by-Hugh-Douglas.pdf
    • http://loaminoo.linkpc.net/1094092090093092/Tommy-s-Honor-The-Story-of-Old-Tom-Morris-and-Young-Tom-Morris-Golf-s-Founding-Father-and-Son-by-Kevin-Cook.pdf
    • http://loaminoo.linkpc.net/1091094097091096092/Hammerhead-Six-How-Green-Berets-Waged-an-Unconventional-War-Against-the-Taliban-to-Win-in-Afghanistan-s-Deadly-Pech-Valley-by-Ronald-Fry.pdf
    • http://loaminoo.linkpc.net/4092098094094097/A-Lawyer-s-Journey-The-Morris-Dees-Story-by-Morris-Dees.pdf
    • http://loaminoo.linkpc.net/1099094090096095/The-Spirit-of-Lagaan-The-Extraordinary-Story-of-the-Creators-of-a-Classic-by-Satyajit-Bhatkal.pdf
    • http://loaminoo.linkpc.net/3093094090092098/Paul-Bernardo-and-Karla-Homolka-The-True-Story-of-the-Ken-and-Barbie-Killers-Crimes-Canada-True-Crimes-That-Shocked-The-Nation-3-by-Peter-Vronsky.pdf
    • http://loaminoo.linkpc.net/6091090090092095/The-Secret-Garden-A-Young-Reader-s-Edition-of-the-Classic-Story-by-Frances-Hodgson-Burnett.pdf
    • http://loaminoo.linkpc.net/1099096096092094/The-True-Story-of-Ah-Q-by-Lu-Xun.pdf
    • http://loaminoo.linkpc.net/5090095095094091/The-Diamond-Lens-Illustrated-A-Classic-Science-Fiction-Short-Story-by-Fitz-James-O-39-Brien.pdf
    • http://loaminoo.linkpc.net/2096090096098099/Sometime-s-Wishes-Do-Come-True-by-D-D-Story.pdf
    • http://loaminoo.linkpc.net/1099096096093099/The-True-Story-of-Lu-Xun-by-David-E-Pollard.pdf
    • http://loaminoo.linkpc.net/4092093092096090/Regal-Realm-A-World-Champion-s-Story-by-Lucinda-Green.pdf
    • http://loaminoo.linkpc.net/2097099091092095/Monster-My-True-Story-by-Aileen-Wuornos.pdf
    • http://loaminoo.linkpc.net/1091091093091095093/the-devil-was-in-me-My-true-story-by-Sahra-Jansen.pdf
    • http://loaminoo.linkpc.net/3096090092092099/Communion-A-True-Story-by-Whitley-Strieber.pdf
    • http://loaminoo.linkpc.net/3098093092099097/God-Has-Failed-Me-A-True-Story-Part-1-by-K-M-Lessing.pdf
    • http://loaminoo.linkpc.net/4098090095093095/The-True-Story-of-Christmas-by-Nelle-Navillus.pdf
    • http://loaminoo.linkpc.net/1099093098099099/Custody-A-True-Story-by-Elizabeth-Morgan.pdf
    • http://loaminoo.linkpc.net/6096098095099093/Cendrillon-The-True-Story-of-Cinderella-by-Tom-Hendricks.pdf
    • http://loaminoo.linkpc.net/3093094090092098/Paul-Bernardo-and-Karla-Homolka-The-True-Story-of-the-Ken-and-Barbie-Killers-Crimes-Canada-Tr