Malicious PDF — malware analysis report

Static analysis result for SHA-256 77a2d1f248201fa4…

MALICIOUS

PDF

36.3 KB Created: 2021-07-03 15:34:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 17829bf4b937ad4f737b295bc87cba4e SHA-1: 8861956762c846317931f6776ac84688a05d4cb7 SHA-256: 77a2d1f248201fa4deef589c28f5229a10c160061791ce431d9ea1069e3fa802
160 Risk Score

Malware Insights

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

The PDF document contains multiple links to known malicious redirectors, disguised as 'free generators' or 'game hacks'. The primary lure directs users to http://netcdn.tw/app/406889139/coin-master-hack-mod-apk-unlimited-spin-download-game-hack, which is flagged as malicious infrastructure. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it exploits PDF vulnerabilities to redirect the user, likely leading to further malicious content or downloads.

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-mod-apk-unlimited-spin-download-game-hack In PDF document text
    • http://cintabaca.org/katalog/repository/roblox-free-online-no-signing-up-or-nothing_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/free-robux-generator-for-roblx_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/free-robux-no-survey-no-download-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/minecraft-handbook_GM479516143.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/get-more-robux_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/how-to-get-free-robux-2021-easy-method_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/roblox-creepy-april-foools-hack-face_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/how-to-hack-roblox-koala-cafe_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/how-to-hack-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/get-free-robux-pc-and-mobile_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/roblox-robux-free-codes-2021_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/free-robux-legit_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/el-mejor-hack-para-roblox_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/roblox-how-to-get-free-accses-to-welcome-to-bloxburg_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/conseguir-robux-gratis-hack_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/apk-roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/minecraft-hack-ios_GM479516143.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/free-headset-in-roblox_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.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_off0000335c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x335C 23468 bytes
SHA-256: faf5328089cd2805840fa516249ff0bd2ea1d2a04f30dc968d7aa5bef4b4a205
font_01_sfnt_off0000686a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x686A 19208 bytes
SHA-256: 168ed34bac05dcfadb60f7a37d17c2e91e9de75542f03c32a69fdbfa53a2f5ea

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