Malicious PDF — malware analysis report

Static analysis result for SHA-256 20bd1999501b1518…

MALICIOUS

PDF

32.4 KB Created: 2021-07-06 19:26:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 4eb969d215707909c54e0c1b1cbba360 SHA-1: 5428aa82fa03d653d7ca638a780f29beb88b3420 SHA-256: 20bd1999501b1518fd60ca40b0fc0bed002d1bf4a92ac9e914a9ca97abcc64b8
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links, including one to a known malicious redirector infrastructure at http://netcdn.tw/app/431946152/how-to-get-a-lot-of-robux-game-hack. The document body and heuristics indicate a lure for game hacks or generators, suggesting a phishing or scam attempt. No scripts were extracted, but the presence of malicious links and the lure indicate a high likelihood of leading users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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/how-to-get-a-lot-of-robux-game-hack In PDF document text
    • http://sellitafrica.com/media/storage/editor/files/hack-coin-master-without-human-verification_GM406889139.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/wwwcoin-master-hack-apk_GM406889139.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/free-spin-sites-for-coin-master_GM406889139.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/how-to-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/coin-master-game-hack_GM406889139.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/no-verificacion-humana-roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/food-empire-roblox-hack_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/abd-roblox_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/roblox-hack-synapse_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/free-coins-for-planet-master-game_GM406889139.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/free-online-generator-for-coin-master_GM406889139.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/cheats-for-roblox-jailbreack_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/robux-free-xyz_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/coin-master-hack-ios-app_GM406889139.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/coin-master-spin-cheat_GM406889139.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/coin-master-free-spins-link-2021-april_GM406889139.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/free-robux-with-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/free-roblox-deadpool-suit_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/roblox-murder-mystery-2-hack-script-pastebin_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/roblox-free-followers_GM431946152.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
font_00_sfnt_off00002ada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2ADA 21584 bytes
SHA-256: ca45e09aa584e9bca42f4cc6468fd41b06ce82d14534e1e715c0401e26fc3ee9
font_01_sfnt_off00005a1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A1D 18820 bytes
SHA-256: cdc6a2a788e7d1c038814bd34757d45de3c8708b5dd2a0e8e1b59012f3bb2d4a

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