Malicious PDF — malware analysis report

Static analysis result for SHA-256 23bced62e89216e2…

MALICIOUS

PDF

46.0 KB Created: 2021-06-11 11:24:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 824236b3d4fda18ef27a67911fb1cc45 SHA-1: dc08b720e53986ef3103e33ef165c5d47d1e6348 SHA-256: 23bced62e89216e25b48eb41d96f254f2391fcd34a241b230bb0b2bf7ac616b4
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure related to game hacks and free Robux to redirect users to a malicious website. The embedded URL, https://netcdn.tw/app/431946152/watch-videos-for-free-robux-game-hack, is identified as a malicious redirector. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest an attempt to exploit user interest in free in-game currency or cheats to lead them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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 https://netcdn.tw/app/431946152/watch-videos-for-free-robux-game-hack In PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/coin-master-get-free-cards_GM406889139.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/free-coins-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/free-safe-roblox-injector-for-hacks_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/free-coins-coin-master_GM406889139.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/toolbox-for-minecraft-ios_GM479516143.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/offers-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/pokemon-go-free-movement_GM1094591345.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/daily-free-spin-link-in-coin-master_GM406889139.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/roblox-cartoony-animation-free_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/robuxlove-net-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/how-to-get-minecraft-bedrock-edition-for-free_GM479516143.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/coin-master-claim-free-spins_GM406889139.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/free-spins-for-coin-master-app_GM406889139.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/coin-master-free-coins-and-spins-2021_GM406889139.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/roblox-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/robux-hack-generator_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_off00005170.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5170 26100 bytes
SHA-256: b6d048f97bef12dffb1af5c0a03b38bac64c58b91fc1fb4b4bd0e720473a85ab
font_01_sfnt_off00008ea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EA6 19140 bytes
SHA-256: 301f4b72018bde41591ea9383aea6da8578dd4e8b92e993503a568e91431ca36

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