Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f01e2cf550ff707…

MALICIOUS

PDF

46.1 KB Created: 2021-06-03 07:19:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 7778bfb98c8e5aa702da5777c01c2dc9 SHA-1: 8d663387a5e0fde97a0bb8889902c190ee1c5ce0 SHA-256: 5f01e2cf550ff7079aa30be75dee6b64af769fb97d06d911841788b8a1fd06f9
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a malformed stream and links to known malicious redirector infrastructure, specifically advertising a 'free generator / game hack'. The ML classifier also flagged this PDF with high confidence. The embedded URL likely leads to a second-stage payload or phishing page, attempting to exploit user interest in game cheats. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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 https://netcdn.online/app/479516143/minecraft-free-apk-game-hack In PDF document text
    • https://www.drsertac.net/upload/content/files/roblox-fun-robux_GM431946152.pdfIn PDF document text
    • https://www.drsertac.net/upload/content/files/coin-master-hack-android-2021_GM406889139.pdfIn PDF document text
    • https://www.drsertac.net/upload/content/files/roblox-rules_GM431946152.pdfIn PDF document text
    • https://www.drsertac.net/upload/content/files/hack-coin-master-no-survey_GM406889139.pdfIn PDF document text
    • https://www.drsertac.net/upload/content/files/games-that-give-free-robux_GM431946152.pdfIn PDF document text
    • https://www.drsertac.net/upload/content/files/coin-master-free-spins-link-download-today_GM406889139.pdfIn PDF document text
    • https://www.drsertac.net/upload/content/files/how-to-get-java-minecraft-free_GM479516143.pdfIn PDF document text
    • https://www.drsertac.net/upload/content/files/free-robux-gift-card_GM431946152.pdfIn PDF document text
    • https://www.drsertac.net/upload/content/files/minecraft-java-edition-free-trial_GM479516143.pdfIn PDF document text
    • https://www.drsertac.net/upload/content/files/free-robux-thumbnail_GM431946152.pdfIn PDF document text
    • https://www.drsertac.net/upload/content/files/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.drsertac.net/upload/content/files/is-minecraft-earth-free_GM479516143.pdfIn PDF document text
    • https://www.drsertac.net/upload/content/files/what-do-roblox-points-do_GM431946152.pdfIn PDF document text
    • https://www.drsertac.net/upload/content/files/free-minecraft-texture-packs-java_GM479516143.pdfIn PDF document text
    • https://www.drsertac.net/upload/content/files/free-minecraft-bedrock-server-hosting_GM479516143.pdfIn PDF document text
    • https://www.drsertac.net/upload/content/files/coin-master-hack-fast_GM406889139.pdfIn PDF document text
    • https://www.drsertac.net/upload/content/files/minecraft-free-computer-game_GM479516143.pdfIn PDF document text
    • https://www.drsertac.net/upload/content/files/coinmaster-free-cards_GM406889139.pdfIn PDF document text
    • https://www.drsertac.net/upload/content/files/coin-master-hack-iosgods_GM406889139.pdfIn PDF document text
    • https://www.drsertac.net/upload/content/files/minecraft-windows-10-edition-unlock-full-game-free_GM479516143.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_off0000553f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x553F 26964 bytes
SHA-256: 6febe23e410cc25eaa27888b9b292168dcdb7528b8eec02f5a92d6b793a720fb
font_01_sfnt_off0000930a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x930A 17912 bytes
SHA-256: 5206acb7ea69a133be6841e1064e2d72a54228dc4d5bb59bfc2f267825fea601

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