Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff907af0d39b515e…

MALICIOUS

PDF

36.6 KB Created: 2021-07-09 20:24:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: c72602a19720be39d2fd2587808ba14b SHA-1: a6be31c208d5f49bb11e3f57cd85ed1e8ce2ee01 SHA-256: ff907af0d39b515e826f50408f098f2b288a4cfcdadc6a5dac1963287e26ad14
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common lure of free game resources to trick users into clicking malicious links. The document contains multiple embedded URLs, including one pointing to a known malicious redirector infrastructure, which is designed to lead users to potentially harmful sites. The ML classifier also strongly indicated maliciousness, supporting the conclusion that this file is part of a phishing or scam campaign.

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-spin-link-today-16-11-2021-game-hack In PDF document text
    • http://achauco.vn/public/upload/files/chamello-free-robux_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/roblox-free-robux-every-5-seconds_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/how-to-make-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/master-coin-free-spin_GM406889139.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/can-a-developer-give-free-gamepasses-roblox_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/free-game-pack-coin-master_GM406889139.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/free-robux-gift-card-codes-2021-april_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/coin-master-hack-without-verification-2021_GM406889139.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/wiki-free-robux_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/how-can-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/robuxlove-net-free-robux_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/free-robux-no-verification-and-no-survey_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/how-to-hack-a-roblox-account-kazok_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/best-free-roblox-executor_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/how-to-watch-any-movie-for-free-tiktok-hack_GM835599320.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/hackear-roblox-pc_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/robux-hack-tool-2021_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_off000034ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x34BA 23404 bytes
SHA-256: 25e011b238dc523749b479853d47875360edbdd3ff1348cb5d22fd646f69e26a
font_01_sfnt_off00006981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6981 19268 bytes
SHA-256: 90a488f9b8999737cef3a0de8620127c76078de1ea7567fa995da797b82280b8

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