Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe8d61dd1e971b63…

MALICIOUS

PDF

35.4 KB Created: 2021-07-03 17:01:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: e943f4e9b5c356b2b4ccf721ad12d9e2 SHA-1: 6d2f7937531d7f4f0cc792ff9b61a573fca8bf39 SHA-256: fe8d61dd1e971b63ea8bfeca8d2100e56c609d80eb645083073db893f3e3aaaa
160 Risk Score

Malware Insights

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

This PDF document contains multiple links to known malicious redirectors and lures users with promises of game hacks and free currency. The primary link, http://netcdn.tw/app/406889139/coin-master-attack-hack-apk-game-hack, is identified as a malicious redirector. The document's structure and embedded URLs suggest an attempt to trick users into downloading potentially harmful software, likely through a social engineering pretext.

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-attack-hack-apk-game-hack In PDF document text
    • http://library.acehresearch.org/repository/how-to-get-free-spins-on-coin-master-without-waiting_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-hack-spins-game-download_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-roblox-clothes-temp-downlode_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/como-tener-robux-gratis-2021-hack_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-robux-without-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/roblox-group-free-robux_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-obc-codes-roblox-unused_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/how-to-hack-coin-master-using-es-filer_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/link-for-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/a-hack-for-roblox-tower-defence_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/how-to-get-verified-on-tiktok-for-free_GM835599320.pdfIn PDF document text
    • http://library.acehresearch.org/repository/roblox-free-accessories_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/pastebin-for-free-robux_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/how-to-earn-robux-free-2021_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-mast-hacks_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/how-to-get-free-robux-quick_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/c-rex-hack-roblox_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/como-hackear-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/robuxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-robux-hack-generator_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_off000032fa.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32FA 23364 bytes
SHA-256: cc97cbbac844426945c6e44729f607b9d8d260ada61b88b7f9aad39775d8dca8
font_01_sfnt_off000067e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67E8 18180 bytes
SHA-256: b07771b1e6622f59a060eb8bfb623c5ff0e255221f4b01e6b608d746b81ae0eb

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