Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b8ac904ace860ef…

MALICIOUS

PDF

32.3 KB Created: 2021-07-19 04:31:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 5b3962870123557200eb4a04506e691a SHA-1: 7aeba0336225045e9185f07f2907e499b5677acb SHA-256: 0b8ac904ace860efc1b089549fbe457c1c4cba6f3f1ff7367d53b4635bd209cc
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically advertising free Robux and game hacks. The document body also contains a prominent call-to-action to access a Robux generator. These elements strongly indicate a phishing or scam attempt designed to lead users to malicious websites. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

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/free-robux-co-game-hack In PDF document text
    • https://engelum.com/images/coin-master-free-spin-codes_GM406889139.pdfIn PDF document text
    • https://engelum.com/images/get-free-robux-now_GM431946152.pdfIn PDF document text
    • https://engelum.com/images/free-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • https://engelum.com/images/games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://engelum.com/images/how-to-get-minecraft-for-free-ios_GM479516143.pdfIn PDF document text
    • https://engelum.com/images/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://engelum.com/images/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdfIn PDF document text
    • https://engelum.com/images/free-robux-discord_GM431946152.pdfIn PDF document text
    • https://engelum.com/images/robux-free-c_GM431946152.pdfIn PDF document text
    • https://engelum.com/images/coin-master-free-spin-today_GM406889139.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_off00002abe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2ABE 22372 bytes
SHA-256: 372249a4f83fdd9cd7d866e6e94530c74a769f19901e46a823b33e8a84ee8a44
font_01_sfnt_off00005c46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C46 18200 bytes
SHA-256: af0a6f01588019b38fd5688102a8ebe17e4b5155afa3360a762aee3dff872896

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