Malicious PDF — malware analysis report

Static analysis result for SHA-256 631ca83e76989d6f…

MALICIOUS

PDF

17.1 KB Created: 2019-05-02 01:38:47 +01:00 Authoring application: mPDF 5.7
MD5: cdcf2869fbee3631481ea98a7527b9ce SHA-1: 0c87210a49fb27948fe60418600b2ae2b4e99227 SHA-256: 631ca83e76989d6fa669911e5a08fc46939950f57f8cc6d717dcbad315d538ae
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. The ML classifier also flagged this PDF as malicious. The primary attack pattern involves directing users to external PDF files, likely to distribute further malware or engage in SEO spam. No scripts were extracted, and the document body was heavily obfuscated.

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://xiixmcuin.linkpc.net/1207208206207207/Helsinki-White-Inspector-Kari-Vaara-3-by-James-Thompson.pdf
    • http://xiixmcuin.linkpc.net/1206208204209/Snow-Angels-Inspector-Kari-Vaara-1-by-James-Thompson.pdf
    • http://xiixmcuin.linkpc.net/3206209200206207/Snow-Angels-Inspector-Kari-Vaara-1-by-James-Thompson.pdf
    • http://xiixmcuin.linkpc.net/1201205205204203200/Anastasia-by-Kari-James.pdf
    • http://xiixmcuin.linkpc.net/3208203206200207/The-American-Temp-and-the-British-Inspector-The-Blackwell-Group-1-by-Pat-White.pdf
    • http://xiixmcuin.linkpc.net/1203202209200201/The-White-War-Life-and-Death-on-the-Italian-Front-1915-1919-by-Mark-Thompson.pdf
    • http://xiixmcuin.linkpc.net/1200202201205208/The-King-James-Only-Controversy-Can-You-Trust-the-Modern-Translations-by-James-R-White.pdf
    • http://xiixmcuin.linkpc.net/4206209209200202/Prayer-for-the-Dead-Inspector-McLean-5-by-James-Oswald.pdf
    • http://xiixmcuin.linkpc.net/9202204209204206/Buckingham-Palace-Blues-Inspector-Carlyle-3-by-James-Craig.pdf
    • http://xiixmcuin.linkpc.net/1202201201206203/The-Helsinki-Pact-by-Alex-Cugia.pdf
    • http://xiixmcuin.linkpc.net/1201208202207200207/The-Facts-Behind-the-Helsinki-Roccamatios-by-Yann-Martel.pdf
    • http://xiixmcuin.linkpc.net/7202203201201208/Fundamentals-of-Queueing-Theory-Solutions-Manual-by-James-M-Thompson.pdf
    • http://xiixmcuin.linkpc.net/3204200204205203/Night-Blood-Elijah-Pike-Vampire-Chronicles-1-by-James-M-Thompson.pdf
    • http://xiixmcuin.linkpc.net/8209207209207201/Die-Todeskarte-Ein-Finnland-Kurzkrimi-Mord-in-Helsinki-3-by-Kerstin-Sj-berg.pdf
    • http://xiixmcuin.linkpc.net/2208207207207204/The-Thompson-Chain-Reference-Study-Bible-NKJV-New-King-James-Version-by-Anonymous.pdf
    • http://xiixmcuin.linkpc.net/7205205202207204/James-Lee-Burke-A-Dave-Robicheaux-Audio-Collection-A-Stained-White-Radiance-In-The-Electric-Mist-With-Confederate-Dead-Dixie-City-Jam-Burning-Angel-and-Cadillac-Jukebox-by-James-Lee-Burke.pdf
    • http://xiixmcuin.linkpc.net/1201204208206208/To-the-White-Sea-by-James-Dickey.pdf
    • http://xiixmcuin.linkpc.net/1201204207202204207/Thompson-amp-Thompson-Genetics-in-Medicine-with-Student-Consult-Online-Access-by-Robert-L-Nussbaum.pdf
    • http://xiixmcuin.linkpc.net/1208205202209/Black-and-White-Men-by-James-Spada.pdf
    • http://xiixmcuin.linkpc.net/3203203207207206/The-White-Deer-by-James-Thurber.pdf