Malicious PDF — malware analysis report

Static analysis result for SHA-256 83f15e2545672968…

MALICIOUS

PDF

35.4 KB Created: 2021-07-06 04:48:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 861095589aa980ff8b23e5c1366ce558 SHA-1: 46d8d614b596966113f99d8c5b255f2549af0472 SHA-256: 83f15e25456729689ae0891a5c2be68eda99bc047989a0ecb5daf79176ff6288
180 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 and game hack lures, indicating a phishing or malware distribution attempt. The malformed stream length and ML classifier flagging further support its malicious nature. While no scripts were explicitly extracted, the embedded URLs and the nature of the lures suggest an attempt to exploit users into downloading further payloads or visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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/406889139/coin-master-free-spins-fb-game-hack In PDF document text
    • http://www.pspmrsmkber.com/opac/repository/free-woman-face-roblox_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/wurst-mc_GM479516143.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/hack-roblox-ipod_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/roblox-cheat-engine-jailbreak-2021_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/public-enemy-sun-prairie-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/download-fly-hack-on-roblox-vampire-hunters_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/get-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/roblox-pet-simulator-cheat-engine_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/free-robux-today_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/how-to-earn-robux_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/roblox-mm2-hacks_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/ww-robux_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/how-to-hack-into-people-in-roblox_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/clubdark-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/free-robux-games-that-actually-work_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/coin-master-free-coins-spins_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/roblox-high-school-2-money-hack_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/free-daily-spins-coin-master-2021_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
stream_002_off000034a7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x34A7 22824 bytes
SHA-256: d63f5af1d4c61f277d4966c4ded7af7964de381d800931bda831a100b621a7b0
font_01_sfnt_off000067b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67B8 18332 bytes
SHA-256: b16e35cdff07ff6c89e4a71134ce3ac4a493311e1784c40c12e5e58564e720d4

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