Malicious PDF — malware analysis report

Static analysis result for SHA-256 812f01777c1d9fa5…

MALICIOUS

PDF

34.8 KB Created: 2021-07-05 01:34:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: fea55c29940751b8737324d80ae38350 SHA-1: 19e1b07c41b07bb27664d0ce4d635d252d20492d SHA-256: 812f01777c1d9fa5a2225a1f5851327069fb0a1c5a72f4c7b3b36837b1217e44
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains multiple embedded links, including one pointing to known malicious redirector infrastructure at http://netcdn.tw/app/431946152/microsoft-rewards-roblox-game-hack. The document body and heuristic firings indicate a lure related to game hacks and rewards, suggesting a phishing or scam attempt. The primary attack pattern involves tricking the user into clicking a malicious link, likely to download further malware or lead them to a credential harvesting page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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/microsoft-rewards-roblox-game-hack In PDF document text
    • http://sellitafrica.com/media/storage/editor/files/did-someone-hack-john-doe-roblox_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/roblox-avatar-com_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/robux-hack-tool-download-2021_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/apocalypse-rising-hacks-roblox-crash_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/minecraft-hacked-client-18_GM479516143.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/coin-master-free-spins-usa-2021_GM406889139.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/minecraft-marketplace-free_GM479516143.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/how-many-levels-does-coin-master-have_GM406889139.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/coin-master-game-hack-app-download_GM406889139.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/buzz-the-bee-gives-free-robux_GM431946152.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/minecraft-fly-hack_GM479516143.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/play-minecraft-free-online-no-download_GM479516143.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/113-hacked-client_GM479516143.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/coin-master-daily-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/can-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/dife-cf-free-robux_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_off0000303a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x303A 22324 bytes
SHA-256: 4e9e0dbd8afd343975fa15e1c7fa14f205bcc0f1bcd5496a16c7708e42676393
font_01_sfnt_off00006210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6210 19244 bytes
SHA-256: d5888bc21d96057e7009fdb8feb27fe5023594e25ad385ee997f7bd9f560ccf5

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