Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8671170717b57fa…

MALICIOUS

PDF

32.8 KB Created: 2021-07-04 13:25:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: cbafb254a11c9e69eb286d3e46e9a912 SHA-1: da9b70dad95e1be4e149a11edb27132f901dff6c SHA-256: d8671170717b57fa903dea650ef8fe1365389736987e3096ea3009824af020b7
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a lure for 'free Robux' and game hacks, directing users to a suspicious URL. The ML classifier strongly indicated maliciousness, and the presence of external URIs suggests a redirection to a malicious site or a phishing attempt. No scripts were extracted, but the document's content and heuristics point to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

Heuristics 4

  • 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.
  • 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 http://netcdn.tw/app/431946152/free-robux-not-fake-game-hack PDF link annotation
    • https://www.cgalgeria-dubai.com/userfiles/files/a-lot-of-robux_GM431946152.pdfIn PDF document text
    • https://www.cgalgeria-dubai.com/userfiles/files/minecraft-free-play-now_GM479516143.pdfIn PDF document text
    • https://www.cgalgeria-dubai.com/userfiles/files/free-roblox-cards-pin-number_GM431946152.pdfIn PDF document text
    • https://www.cgalgeria-dubai.com/userfiles/files/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://www.cgalgeria-dubai.com/userfiles/files/coin-master-free-spins--spins_GM406889139.pdfIn PDF document text
    • https://www.cgalgeria-dubai.com/userfiles/files/redeem-roblox-card-free_GM431946152.pdfIn PDF document text
    • https://www.cgalgeria-dubai.com/userfiles/files/account-passwort-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.cgalgeria-dubai.com/userfiles/files/orewards-com-free-robux_GM431946152.pdfIn PDF document text
    • https://www.cgalgeria-dubai.com/userfiles/files/inappropriate-roblox_GM431946152.pdfIn PDF document text
    • https://www.cgalgeria-dubai.com/userfiles/files/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • https://www.cgalgeria-dubai.com/userfiles/files/coin-master-time-hack-ios_GM406889139.pdfIn PDF document text
    • https://www.cgalgeria-dubai.com/userfiles/files/coin-master-hack-mod-apk-35-8_GM406889139.pdfIn PDF document text
    • https://www.cgalgeria-dubai.com/userfiles/files/rbxfree-com-free-robux_GM431946152.pdfIn PDF document text
    • https://www.cgalgeria-dubai.com/userfiles/files/roblox-hack-mo_GM431946152.pdfIn PDF document text
    • https://www.cgalgeria-dubai.com/userfiles/files/free-coins-and-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.cgalgeria-dubai.com/userfiles/files/coinmasterfree_GM406889139.pdfIn PDF document text
    • https://www.cgalgeria-dubai.com/userfiles/files/free-coin-master-app_GM406889139.pdfIn PDF document text
    • https://www.cgalgeria-dubai.com/userfiles/files/hack-master-coin_GM406889139.pdfIn PDF document text
    • https://www.cgalgeria-dubai.com/userfiles/files/freerobuxhack-us_GM431946152.pdfIn PDF document text
    • https://www.cgalgeria-dubai.com/userfiles/files/mobihack-roblox-hack_GM431946152.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
font_00_sfnt_off00002a4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A4A 22168 bytes
SHA-256: abf128af94943645c0c7b631ea9c3e40c06688d82f8fdb4248aa6589995ea39c
font_01_sfnt_off00005b7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B7E 18992 bytes
SHA-256: e4ac39d57ff956450bb8dd48df15acc1078399c4d14e18067568ebfa6ae85f6b