Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f28e8ee73064e37…

MALICIOUS

PDF

34.2 KB Created: 2021-07-03 13:36:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 77125473c11a7a191e52ee44050e7fd8 SHA-1: 455ad5911185c7e9bbb7c55d2d26a793475879a4 SHA-256: 2f28e8ee73064e370ac65403d9e72360f716efd7ef09ee048f84fa6673f8074b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to a known malicious redirector, disguised as a 'free generator / game hack'. The document body and embedded URLs explicitly mention 'free Robux', 'free spins', and 'hacks', indicating a lure for potentially unwanted or malicious content. The ML classifier also flagged this PDF with high confidence.

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/431946152/wahoo-gaming-co-free-robux-game-hack In PDF document text
    • http://lib.uho.ac.id/library/repository/free-spins-coin-master-app-ios_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/minecraft-hacked-client-18_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-rare-cards-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-hack-apk-35-13_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-roblox-codes_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-currency-hack_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/hack-coin-master-link_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/how-to-get-free-admin-in-roblox_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-robux-we-are-devs_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/cheat-engine-roblox-trainer_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-hack-app_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/hack-velocidad-roblox_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-paypal-accounts-with-money-for-roblox-with-card-code_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/f-r-e-e-that-spells-free-roblox-id_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/www-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
font_00_sfnt_off00002dd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DD3 22280 bytes
SHA-256: caf817932f8e61ca31b3994d6d10b82f76706aeb340851581eb828d98cb12393
font_01_sfnt_off00005f8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F8B 19460 bytes
SHA-256: 25181eaa6be0d5b476285318664890f4926978dca9587ea82b488640a0a05646