Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fcb326a7d5d39c6…

MALICIOUS

PDF

16.6 KB Created: 2019-05-07 03:33:38 +01:00 Authoring application: mPDF 5.7
MD5: 78537f4f72a900cfb1625751a67efe6e SHA-1: 4cab7d4bc0a6f0070f0e4ce50176ec1bee26b915 SHA-256: 6fcb326a7d5d39c69e52bf761e825db00233639f3866d29769a7c591769eabae
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded URLs, many of which are structured as numeric slugs, suggesting a link farm designed to direct users to external content. The heuristic 'PDF_SEO_LINK_FARM' and the presence of numerous URLs in the document body strongly indicate this malicious intent. While no scripts were extracted, the sheer volume of links and the ML classifier's high confidence score support the assessment of maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 3

  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://xiixmcui
    • http://xiixmcuin.linkpc.net/1201204200208207203/The-Curly-Pyjama-Letters-by-Michael-Leunig.pdf
    • http://xiixmcuin.linkpc.net/1201209207203204/Dreamwalker-by-S-L-Seay.pdf
    • http://xiixmcuin.linkpc.net/3200209208205208/I-Must-Be-Dreaming-by-S-L-Seay.pdf
    • http://xiixmcuin.linkpc.net/7203203205205203/In-the-Hands-of-A-Chef-Cooking-with-Jody-Adams-of-Rialto-Restaurant-by-Jody-Adams.pdf
    • http://xiixmcuin.linkpc.net/9205206201204206/Curly-An-Illustrated-Biography-of-the-Superstooge-by-Joan-Howard-Maurer.pdf
    • http://xiixmcuin.linkpc.net/5200208209205200/To-See-The-Queen-Poems-by-Allison-Seay.pdf
    • http://xiixmcuin.linkpc.net/2203209204205203/Searching-for-Lost-City-On-the-Trail-of-America-s-Native-Languages-by-Elizabeth-Seay.pdf
    • http://xiixmcuin.linkpc.net/1202203205202203/F-Bomb-A-Story-About-Coming-Out-and-Coming-Out-of-One-s-Shell-by-Naomi-Rabinowitz.pdf
    • http://xiixmcuin.linkpc.net/1205203201204203/My-Red-Blood-A-Memoir-of-Growing-Up-Communist-Coming-Onto-the-Greenwich-Village-Folk-Scene-and-Coming-Out-in-the-Feminist-Movement-by-Alix-Dobkin.pdf
    • http://xiixmcuin.linkpc.net/4207202205202/The-Fig-Eater-by-Jody-Shields.pdf
    • http://xiixmcuin.linkpc.net/1201206208204208209/The-Joy-of-Cheesemaking-by-Jody-Farnham.pdf
    • http://xiixmcuin.linkpc.net/7203203203206203/Jody-s-Men-by-Lynn-Ray-Lewis.pdf
    • http://xiixmcuin.linkpc.net/1209207208202207/Tart-by-Jody-Gehrman.pdf
    • http://xiixmcuin.linkpc.net/5200209209206202/Prodigal-by-Jody-Wallace.pdf
    • http://xiixmcuin.linkpc.net/5201203205200202/Will-We-Be-Smart-Enough-A-Cognitive-Analysis-of-the-Coming-Workforce-A-Cognitive-Analysis-of-the-Coming-Workforce-by-Earl-Hunt.pdf
    • http://xiixmcuin.linkpc.net/1200209205202200202/Higher-Mythology-by-Jody-Lynn-Nye.pdf
    • http://xiixmcuin.linkpc.net/7203203204207203/The-Story-Of-Jody-by-Karin-Mutch.pdf
    • http://xiixmcuin.linkpc.net/1203203202203/The-Gollywhopper-Games-by-Jody-Feldman.pdf
    • http://xiixmcuin.linkpc.net/6204209201205206/Finding-Charity-by-Jody-Pardo.pdf
    • http://xiixmcuin.linkpc.net/2208200206209201/Marked-Howl-5-by-Jody-Morse.pdf