Malicious PDF — malware analysis report

Static analysis result for SHA-256 e631a1afbcb32f5c…

MALICIOUS

PDF

41.4 KB Created: 2021-05-12 21:33:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 9298ac27d7e53bf51600a0a21a82f629 SHA-1: 57e465c021abdadba9cee276a084e289a4b17c8b SHA-256: e631a1afbcb32f5c9d2173567107ebe9d88fae20f999a3803d6d539b32e9cd32
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting game hacks and free coins. The ML classifier strongly indicated maliciousness, and the document body itself contains obfuscated text and URLs pointing to known malicious redirectors. The primary attack pattern observed is the use of a lure to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/406889139/pig-master-free-coins-and-spins-game-hack In PDF document text
    • https://www.devries-group.de/images/master-coin-hack-app_GM406889139.pdfIn PDF document text
    • https://www.devries-group.de/images/coinmaster-twitter_GM406889139.pdfIn PDF document text
    • https://www.devries-group.de/images/orewards-com-free-robux_GM431946152.pdfIn PDF document text
    • https://www.devries-group.de/images/free-roblox-hack-us_GM431946152.pdfIn PDF document text
    • https://www.devries-group.de/images/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.devries-group.de/images/hack-card-collection-coin-master_GM406889139.pdfIn PDF document text
    • https://www.devries-group.de/images/free-spins_GM406889139.pdfIn PDF document text
    • https://www.devries-group.de/images/free-coin-master-spins-blog_GM406889139.pdfIn PDF document text
    • https://www.devries-group.de/images/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.devries-group.de/images/minecraft-free-no-download_GM479516143.pdfIn PDF document text
    • https://www.devries-group.de/images/haktuts-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • https://www.devries-group.de/images/roblox-bloxburg-hack_GM431946152.pdfIn PDF document text
    • https://www.devries-group.de/images/coin-master-hacks-and-cheats_GM406889139.pdfIn PDF document text
    • https://www.devries-group.de/images/i-robux_GM431946152.pdfIn PDF document text
    • https://www.devries-group.de/images/free-robux-games-that-actually-work_GM431946152.pdfIn PDF document text
    • https://www.devries-group.de/images/get-free-lives-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.devries-group.de/images/how-to-get-a-free-dominus-in-roblox_GM431946152.pdfIn PDF document text
    • https://www.devries-group.de/images/minecraft-java-hacks_GM479516143.pdfIn PDF document text
    • https://www.devries-group.de/images/minecraft-free-no-virus_GM479516143.pdfIn PDF document text
    • https://www.devries-group.de/images/free-robux-hack-us_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004611.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4611 24544 bytes
SHA-256: 1796ee940d82808691c922a3cd75a23bed768e3a5c21922cae36906ab9416bd7
font_01_sfnt_off00007ecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7ECF 18504 bytes
SHA-256: 61a83f927df5edb9f478f7ef694b2c9e4338115fc73db665eb245c70cf9f9e5c

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