Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bf14f0ad5264661…

MALICIOUS

PDF

45.3 KB Created: 2021-06-10 22:40:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 403799a220f91e1e00562ddb0303fcf6 SHA-1: 489e2200a08db4958715b32b70c13a4c0233c561 SHA-256: 9bf14f0ad5264661e9c96761a69eb4eb84610c0dd48661198e0ce75a2cdff5f4
200 Risk Score

Malware Insights

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

The PDF document contains multiple links to a redirector URL, masquerading as a 'free generator' or 'game hack' to impersonate Amazon and lure users. The ML classifier strongly indicated maliciousness, and the embedded links suggest a credential phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 5

  • 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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.tw/app/431946152/free-roblox-gift-card-codes-2021-game-hack.
  • 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 https://netcdn.tw/app/431946152/free-roblox-gift-card-codes-2021-game-hack In PDF document text
    • http://library-fkip.uho.ac.id/repository/wall-hacks-and-aimbot-roblox_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/how-to-get-minecraft-windows-10-edition-for-free_GM479516143.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/coin-master-hack-game-download_GM406889139.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/how-get-robux-free_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/coin-master-free-spins-hack-apk-download_GM406889139.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/how-to-hack-power-training-simulator-roblox_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/minecraft-gun-games-free_GM479516143.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/uitbxclub-roblox-robux-hacking_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/free-coin-master-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/minecraft-free-download-pc_GM479516143.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/coin-master-coins-free_GM406889139.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/free-robux-cards_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/roblox-hack-cheat-engine-63_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/how-to-download-minecraft-java-edition-for-free_GM479516143.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/roblox-creepy-elevator-hack-script_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/rolbox-robux-hack_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_004_off0000552b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x552B 24340 bytes
SHA-256: 06769d1a7daa34b4e981a0a453603dab3229c8c8008169d8b3c9160510cf1c24
font_01_sfnt_off00008c51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C51 18976 bytes
SHA-256: da888a05767b354bf4a788b28622fcb1db99041a598c845d67a69c5c37b8a5f7

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