Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcb893ef7d5d20f9…

MALICIOUS

PDF

45.5 KB Created: 2021-05-11 00:31:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 1b7cf84498bb755659ad0caf8c60144b SHA-1: 5f089295fc84d286c7d2407dcdffa1c77df3e7fd SHA-256: bcb893ef7d5d20f9062d6d241da1a88b1cda09915c60c5938e7c7943ac230fab
160 Risk Score

Malware Insights

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

The PDF contains multiple links to known malicious redirectors, specifically promoting 'free Robux' or 'game hacks' as a lure. The document body and embedded URLs reinforce this theme, directing users to potentially malicious sites. The presence of a download button heuristic further suggests a workflow intended to trick users into downloading a payload.

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 https://netcdn.xyz/app/431946152/free-robux-no-generator-game-hack In PDF document text
    • http://sellitafrica.com/media/storage/editor/files/mc-hacks_GM479516143.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/minecraft-life-hacks_GM479516143.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/robux-free-2021_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/cmaster-club-coin-master-hack-tool_GM406889139.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/claim-free-robux-button_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/how-to-get-a-lot-of-robux_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/how-do-you-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/coin-master-hacks-for-pet-food_GM406889139.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/coin-master-hack-apk-35-11_GM406889139.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/robux-hack-me_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/coin-master-free-coins--spins_GM406889139.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/free-2021-robux_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/coin-master-35-2-hack_GM406889139.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/roblox-assassin_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/coin-master-hacks-iphone_GM406889139.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/spin-link-coin-master_GM406889139.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/rbxoffer-com-free-robux_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/heroes-online-roblox_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_off00004900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4900 33168 bytes
SHA-256: ca6268519adbbad7baf733a48541ec85054d460108da911e0e5c6539e1598b79
font_01_sfnt_off00008f8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F8D 18344 bytes
SHA-256: d0a2580a9848789708f711aeedd4c44eef26827bf748da476089155bc80243e8

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