Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcc678e88c2044db…

MALICIOUS

PDF

34.0 KB Created: 2021-07-09 03:04:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: a38decb03fb6107f7d49196f56aef235 SHA-1: c1d9b289d4b222eced678df148af5057a6c99dd4 SHA-256: dcc678e88c2044dbd70c57f0a36f7a798e2b58bb770f617294e7dcf73462fe07
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs that redirect to sites offering game hacks and generators, a common lure for malicious content. The heuristic firings indicate that the document links to known malicious redirector infrastructure, specifically http://netcdn.tw/app/406889139/coin-master-hack-software-game-hack. While no scripts were extracted, the document's structure and embedded links strongly suggest it is designed to lead the user to download potentially unwanted or malicious software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/coin-master-hack-software-game-hack In PDF document text
    • https://encounternepal.com/userfiles/files/minecraft-free_GM479516143.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-to-get-hacks-on-roblox_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-robux-real-working_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-to-get-actually-hacks-on-roblox-not-a-model_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/minecraft-xray-hack_GM479516143.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-free-spins-facebook_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coinmaster-rewards_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-card-link-free_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/best-free-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/roblox-adonis-admin-hack_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-free-spins-today-daily-links_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/checkmein-roblox-free_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-robux-android_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-minecraft-coins_GM479516143.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-apk-hack-download_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/roblox-download-mac-free_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-coin-master-stuff_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-free-spins-no-generator_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/hack-client_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_002_off00002f1e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2F1E 22784 bytes
SHA-256: 40b23f0755887fc75bd9a0883547b36ae00c669864d67854d7e13b14a1a2ce94
font_01_sfnt_off0000623a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x623A 18168 bytes
SHA-256: 8b2230ea6675be3dae677a652bf5a3a8bf2d1463166284366049cff244d27dbd

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