Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2838d0eb31496f9…

MALICIOUS

PDF

35.0 KB Created: 2021-07-06 05:00:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: c6b90f2ab26b2981c1ce8e0873391174 SHA-1: 291936a4d51a5c8807031adc6f06f00d20761b43 SHA-256: c2838d0eb31496f922c9a731825eae5aa341f6f71fbbe45eb427990a33b7073d
160 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 lures users with promises of game hacks and free currency. The primary malicious URL identified is http://netcdn.tw/app/406889139/coin-master-free-spins-and-coins-for-iphone-game-hack, which is flagged as a malicious redirector. The document body and embedded URLs suggest a phishing or scam campaign aimed at users seeking in-game advantages.

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-free-spins-and-coins-for-iphone-game-hack In PDF document text
    • http://library.stikessuakainsan.ac.id/repository/roblox-weapon-hack_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id//repository/my-robux_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/how-to-hack-roblox-games-on-android_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/roblox-hack-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id//repository/download-minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/roblox-city-free-robux_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id//repository/coin-master-hack-2021-ios-download_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/free-roblox-card-id_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/how-to-talk-to-roblox-if-you-get-hacked_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/free-robux-pastebin-no-wait-no-subscribe_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/downloader-for-free-robux_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/how-to-buy-anything-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/roblox-bubble-gum-sim-hack_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/free-spins-coin-master-ios-links_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/coin-master-hack-2021-ios_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/robux-adder_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/arsenal-cheats-roblox_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/roblox-booga-booga-hack-download-2021_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/roblox-50-robux-free_GM431946152.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_off000032ef.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32EF 22700 bytes
SHA-256: 1dac9d8ca99ef7b1ff48f44c0ffbb9869e5647fad41f09191186fdccb5270bb6
font_01_sfnt_off000065b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65B7 18516 bytes
SHA-256: 61996f55897b37017ba853d195353342f2e66f917d6eb2c1ba4c42edcff5bab8

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