Malicious PDF — malware analysis report

Static analysis result for SHA-256 67a0628c8d45a397…

MALICIOUS

PDF

44.9 KB Created: 2021-06-08 17:06:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 48cec01f57b49c34f5c3ce8ee4d1de54 SHA-1: a27d0b678c85e7e7c5f2ab8593104ec3779c6e40 SHA-256: 67a0628c8d45a39730594e4a612f98ba45e224dbb49fb66fe83eb8fa01537eb6
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically promoting 'free game hacks' and 'robux generators'. The document body and embedded URLs strongly suggest a phishing or scam attempt designed to lure users to potentially malicious websites. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.tw/app/431946152/robux-rbx-calc-free-game-hack In PDF document text
    • http://altc.de/images/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://altc.de/images/get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://altc.de/images/robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://altc.de/images/coin-master-hack-ios-download-2021_GM406889139.pdfIn PDF document text
    • http://altc.de/images/free-coins-for-coin-master-blogger_GM406889139.pdfIn PDF document text
    • http://altc.de/images/free-roblox-items-codes_GM431946152.pdfIn PDF document text
    • http://altc.de/images/how-to-get-furniture-for-free-on-roblox-highschool_GM431946152.pdfIn PDF document text
    • http://altc.de/images/free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://altc.de/images/coin-master-server-hack_GM406889139.pdfIn PDF document text
    • http://altc.de/images/how-to-get-100-robux-for-free_GM431946152.pdfIn PDF document text
    • http://altc.de/images/online-hacking-tricks-coin-master_GM406889139.pdfIn PDF document text
    • http://altc.de/images/free-robux-website_GM431946152.pdfIn PDF document text
    • http://altc.de/images/free-roblox-combo-list_GM431946152.pdfIn PDF document text
    • http://altc.de/images/free-roblox-hacks-free-robux_GM431946152.pdfIn PDF document text
    • http://altc.de/images/coin-master-free-stuff_GM406889139.pdfIn PDF document text
    • http://altc.de/images/facebook-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://altc.de/images/bux-life-free-robux_GM431946152.pdfIn PDF document text
    • http://altc.de/images/free-shoulder-pet-roblox_GM431946152.pdfIn PDF document text
    • http://altc.de/images/get-free-400-robux-robuxcodes_GM431946152.pdfIn PDF document text
    • http://altc.de/images/como-hackear-una-cuenta-de-roblox-2021_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
stream_004_off00004f57.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F57 27116 bytes
SHA-256: 32a98e7fea77a3e2061c39afd00a8dd126cbd614a5f97fff041ec5df3cc4bcf7
font_01_sfnt_off00008ce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CE2 18316 bytes
SHA-256: 86361f2fb5afbbe38e2929e780f6f9950fd364474e3deee4e4e463426c8413b0

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