Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfe0430bb1432347…

MALICIOUS

PDF

34.8 KB Created: 2021-07-05 11:57:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: f9e50520fbe0935d184c4678b2fba40a SHA-1: 65acf9c5892f9f52487886f11b1926e51720f44a SHA-256: cfe0430bb1432347dfcc83c8d4258b602641ad8f75dd43053d6045c5597fe9ff
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs that redirect to malicious infrastructure, specifically promoting 'free coins' for games like Coin Master. The document body and heuristics indicate a lure for game-related cheats or generators, which is a common social engineering tactic. The ML classifier strongly flagged this PDF as malicious, and the presence of redirector links suggests an attempt to lead the user to a site that likely hosts further malicious content or exploits.

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/free-coins-coin-master-link-today-game-hack In PDF document text
    • http://e-library.stienobel-indonesia.ac.id/repository/free-spins-and-coins-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id/repository/get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id/repository/free-foxy-food-coin-master_GM406889139.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id//repository/hack-coin-master-apk-2021_GM406889139.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id/repository/pokemon-go-free-storage-upgrade_GM1094591345.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id/repository/how-to-get-more-robux_GM431946152.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id/repository/free-spins-and-coins-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id/repository/free-robux-no-verification-at-all_GM431946152.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id//repository/hack-coin-master-2021-pc_GM406889139.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id//repository/earn-free-robux-today_GM431946152.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id/repository/how-to-get-free-coins-in-minecraft_GM479516143.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id//repository/roblox-generator-com_GM431946152.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id//repository/free-coin-master-spins-for-today_GM406889139.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id/repository/free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id//repository/pop-slots-free-vegas-casino-slots-machine-game-coin-master_GM406889139.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id/repository/best-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id/repository/roblox-18_GM431946152.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id//repository/coin-master-game-hack-kaise-kare_GM406889139.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id//repository/robux-money_GM431946152.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id/repository/free-robux-hack-no-human-verification-or-survey_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
font_00_sfnt_off000031bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31BF 22720 bytes
SHA-256: b07029b561112aa73bf43668fb7e674fe33f0d4c1a1d1714398b497c2a2c0b32
font_01_sfnt_off000064b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64B8 18524 bytes
SHA-256: 297430194eb73c4ac2f61cbe4529582c63f21c54530b07b0a2ae70a59bdd50b1

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