Malicious PDF — malware analysis report

Static analysis result for SHA-256 12b678925e901a39…

MALICIOUS

PDF

40.5 KB Created: 2021-04-30 17:49:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 4fd1e65e49885dcd3a92fb17d6fbddd2 SHA-1: 8ec0d46b262afcd8c336502b4b591c6993ac9ee7 SHA-256: 12b678925e901a39a9a65d3e8ca1f921e5c8f5c3057af38542c5de04b030d68c
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1553.005 Mark-of-the-Web Bypass

The PDF document contains a high-severity heuristic indicating it links to a 'free generator / game hack' lure, impersonating the Facebook brand. The primary IOC is the malicious URL which likely leads to credential phishing or a further malware download. No scripts were extracted, but the PDF structure and embedded links suggest a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.xyz/app/431946152/rblx-gg-roblox-free-game-hack.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://netcdn.xyz/app/431946152/rblx-gg-roblox-free-game-hack PDF link annotation
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/how-to-get-it-free-robux.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/how-to-cheat-infinite-jump-in-roblox.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/hacking-a-roblox-fans.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/ss-hub-free-roblox.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/roblox-restaurant-tycoon-hack-lua-c.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/roblox-free-roblox-accounts.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/roblox-vehicle-simulator-hack-2021.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/2021-roblox-free-accounts-facebook.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/free-rs-obc-tbc-bc-gain-95-2021-free-robuxs.pdfIn PDF document text
    • http://technibuild-group.com/uploaded_files/userfiles/files/roblox-gun-simulator-money-hack.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000041e3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x41E3 26088 bytes
SHA-256: 632e6a599108e51b2c7f06038c6bcd8a89288cd2b1c28afd610064ffbead1248
font_01_sfnt_off00007cc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CC0 18236 bytes
SHA-256: 0b577228c0402f506a32fe8ed0d540f557aef6d5563059f43cee8f8da061fe82

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