Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa879cbae9086948…

MALICIOUS

PDF

44.8 KB Created: 2021-06-03 07:58:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: fc5b3cb46859dd278195e83a0e1cdb59 SHA-1: cf9d37323af2c6b4288852c773f02de5af71086d SHA-256: aa879cbae9086948d9d0be99eba872f7e4f5506f7752d0c93576caba120a509c
142 Risk Score

Malware Insights

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

The PDF contains numerous links to websites that claim to offer free game currency or hacks, a common lure for phishing or malware distribution. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, suggesting a malicious intent to redirect users to potentially harmful sites. While no scripts were extracted, the presence of external links and the ML classification strongly suggest a malicious document designed to exploit user interest in free in-game items.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • 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.
  • 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 https://netcdn.online/app/431946152/bux-life-free-robux-game-hack PDF link annotation
    • https://susantomeubel.com/ckfinder/userfiles/files/robux-fun-hack_GM431946152.pdfIn PDF document text
    • https://susantomeubel.com/ckfinder/userfiles/files/minecraft-life-hacks_GM479516143.pdfIn PDF document text
    • https://susantomeubel.com/ckfinder/userfiles/files/free-robux-for-kids_GM431946152.pdfIn PDF document text
    • https://susantomeubel.com/ckfinder/userfiles/files/how-to-get-free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • https://susantomeubel.com/ckfinder/userfiles/files/can-you-still-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • https://susantomeubel.com/ckfinder/userfiles/files/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • https://susantomeubel.com/ckfinder/userfiles/files/free-robux-just-enter-username_GM431946152.pdfIn PDF document text
    • https://susantomeubel.com/ckfinder/userfiles/files/how-do-you-get-free-roblox_GM431946152.pdfIn PDF document text
    • https://susantomeubel.com/ckfinder/userfiles/files/coin-master-free-spin-today_GM406889139.pdfIn PDF document text
    • https://susantomeubel.com/ckfinder/userfiles/files/can-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://susantomeubel.com/ckfinder/userfiles/files/coin-master-free-codes_GM406889139.pdfIn PDF document text
    • https://susantomeubel.com/ckfinder/userfiles/files/websites-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://susantomeubel.com/ckfinder/userfiles/files/daily-free-spins_GM406889139.pdfIn PDF document text
    • https://susantomeubel.com/ckfinder/userfiles/files/free-disney-plus-accounts-tiktok_GM835599320.pdfIn PDF document text
    • https://susantomeubel.com/ckfinder/userfiles/files/coin-master-hack-apk-with-fb-login_GM406889139.pdfIn PDF document text
    • https://susantomeubel.com/ckfinder/userfiles/files/toolbox-for-minecraft-windows-10_GM479516143.pdfIn PDF document text
    • https://susantomeubel.com/ckfinder/userfiles/files/coin-master-attack-hack-apk_GM406889139.pdfIn PDF document text
    • https://susantomeubel.com/ckfinder/userfiles/files/free-spins-coin-master-generator_GM406889139.pdfIn PDF document text
    • https://susantomeubel.com/ckfinder/userfiles/files/coin-master-hack-spin-generator_GM406889139.pdfIn PDF document text
    • https://susantomeubel.com/ckfinder/userfiles/files/archery-master-3d-unlimited-coins-hack_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005443.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5443 24776 bytes
SHA-256: 307c9bfc4c8bf9807870bf0e233b2b0dfa63c0480105ca0cb1e9c20ddf81b14c
font_01_sfnt_off00008d30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D30 18136 bytes
SHA-256: 29dc967668ee0d992c179c4e94ca6f9cb219d50b5ccf800f63d20fdab69e699e

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