Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f4644cb8da6ed53…

MALICIOUS

PDF

35.2 KB Created: 2021-07-19 13:51:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: f7828b306ae28aa6a582d8f55c16e19c SHA-1: 74f109d58d66236beab3545f3edbf95c8ce7aa6b SHA-256: 4f4644cb8da6ed5319e56717199600b9397fc4319a0110c553818afe6d8a18e5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common lure of free game items and currency to trick users into clicking malicious links. The primary link directs to a known malicious redirector infrastructure, which in turn serves further lures for various games. The document's structure and embedded links suggest it is part of a phishing campaign designed to lead users to potentially malicious sites or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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-spins-link-blogspot-2021-game-hack In PDF document text
    • http://pesok-rk.ru/images/how-to-get-minecraft-for-free-on-mac_GM479516143.pdfIn PDF document text
    • http://pesok-rk.ru/images/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://pesok-rk.ru/images/is-minecraft-free-on-nintendo-switch_GM479516143.pdfIn PDF document text
    • http://pesok-rk.ru/images/free-roblox-accounts-with-robux_GM431946152.pdfIn PDF document text
    • http://pesok-rk.ru/images/free-tiktok-likes-2021_GM835599320.pdfIn PDF document text
    • http://pesok-rk.ru/images/free-tiktok-fans_GM835599320.pdfIn PDF document text
    • http://pesok-rk.ru/images/minecraft-free-android_GM479516143.pdfIn PDF document text
    • http://pesok-rk.ru/images/how-to-get-minecraft-for-free-on-android_GM479516143.pdfIn PDF document text
    • http://pesok-rk.ru/images/robux-hack_GM431946152.pdfIn PDF document text
    • http://pesok-rk.ru/images/free-robux-games_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_off0000304b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x304B 23460 bytes
SHA-256: ff42ab3cfaf46638b3a3e0da5c7d99b170cfc0cbed8e95deb546102c49b3a175
font_01_sfnt_off00006578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6578 19036 bytes
SHA-256: a1db0e26d638f2546736f1f7b434dee98a1c5e726f40723477b7c203db66759e