Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb7f1e0843cffff7…

MALICIOUS

PDF

34.4 KB Created: 2021-07-06 08:27:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: d37a9ebdd9aaa47e042a808825faaf81 SHA-1: d7b614e3137b22750d8c16f3f12b815c06dcd3dc SHA-256: eb7f1e0843cffff7cd73c029f11549280a10fc66558bc53fefd35569e1b55814
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector infrastructure, specifically http://netcdn.tw/app/431946152/free-robux-mod-game-hack, which is presented as a lure for free Robux or game hacks. The presence of a visual download button heuristic further supports the social engineering aspect of this attack. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly indicate a malicious redirection chain designed to deliver a secondary payload or phish user credentials.

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/free-robux-mod-game-hack In PDF document text
    • http://muslib.unmus.ac.id/repository/free-roblox-card-codes_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/hallowen-simualtor-hack-roblox_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-fix-roblox-studio-from-hacking_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/roblox-install-free_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-adopt-me-bucks-hack_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-fashion-frenzy-roblox_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-get-free-robux-using-promo-codes-2021_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-noclip-and-speed-hack-in-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/cm-spin-link_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-roblox-id-codes_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/actual-ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/when-will-vesteria-beta-be-free-roblox_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-roblox-generator-club_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-games-hack_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/giving-away-free-toy-codes-for-roblox_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/how-to-get-minecraft-for-free-ios_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/minecraft-images-free_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/how-to-get-minecraft-for-free-on-ps4-2021_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/wie-kann-man-ihn-roblox-hacken_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-craftwars-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
font_00_sfnt_off0000304e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x304E 22072 bytes
SHA-256: 2a03a1ac6bd48c420e25084f0fcda7993d97a806239be03f168f566819bc7681
font_01_sfnt_off00006154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6154 19088 bytes
SHA-256: 3c56140fee9dfb5ded46378f21a8de948775312b2d7b3282d1f8cc46bd34fe6a

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