Malicious PDF — malware analysis report

Static analysis result for SHA-256 199c2ea64cbbc6fc…

MALICIOUS

PDF

47.5 KB Created: 2021-05-15 15:57:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 7641c249fd592aa29aeb099f9f9e7744 SHA-1: ac19f4449c1543d50071d0dd0252ddae63b9a37c SHA-256: 199c2ea64cbbc6fce22d1a4531bc11329258962ed1d33d34bc9b3decd15c2cd0
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to websites offering "game hacks" and "free robux", which is a common lure for phishing and malware distribution. The heuristic firings indicate that the PDF links to known malicious redirector infrastructure and is flagged by an ML classifier. The document body, though partially obfuscated, contains the URL that is also present in the heuristics and IOCs, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9013

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/robux-hack-no-verification-game-hack In PDF document text
    • http://ff-klaffenbach.de/images/minecraft-games-free-download_GM479516143.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/robux-adder_GM431946152.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/free-robux-no-verification-needed_GM431946152.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/coin-master-hack-online-pc_GM406889139.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/flame-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/coin-master-spin-hack-apk_GM406889139.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/huskybuckscom-free-robux_GM431946152.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/apps-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/coin-master-hack-apk-online_GM406889139.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/is-there-a-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/how-to-download-minecraft-for-free-on-android_GM479516143.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/easy-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/how-to-win-free-robux_GM431946152.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/coin-master-hack-pc-free_GM406889139.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/how-do-u-hack-roblox_GM431946152.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/free-robux-no-human-verification-or-survey-or-download_GM431946152.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/buy-robux-free_GM431946152.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/roblox-controversy_GM431946152.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/coin-master-official-page_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004a0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A0B 28092 bytes
SHA-256: c1dd1266dd6ecde1640c50c7d0457f821440321c2f7f66de908b588a32781b32
font_01_sfnt_off0000893c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x893C 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off0000964d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x964D 18604 bytes
SHA-256: 770f8f6a3c3ea9ac3c319881d9f8005aae44889e6d1fc0dc42f8814bbcec8619

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