Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca28bce4272fcbf5…

MALICIOUS

PDF

34.9 KB Created: 2021-07-03 23:36:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 5cd75ded37769475087094b42d4cdaec SHA-1: c29273f9705dbde9e871f3860440f4522dcc04b5 SHA-256: ca28bce4272fcbf5129754eafc2289026623bf5d72e3729060266e05347b09d3
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links designed to lure users into clicking on what appear to be free game item generators or hacks. The primary link, http://netcdn.tw/app/431946152/free-roblox-gift-card-codes-2021-game-hack, is flagged as a malicious redirector. The document body and heuristics indicate a scam or phishing attempt leveraging popular games like Roblox and Coin Master. No scripts were extracted, but the extensive link farm suggests a high likelihood of redirecting users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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-roblox-gift-card-codes-2021-game-hack In PDF document text
    • http://digilib.iailm.ac.id/repository/free-robux-no-verification-or-survey-or-download_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/roblox-hack-robux-cheat-engine-61_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/robine-roblox-hack_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/free-roblox-items-com_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/coin-master-free-shield-link_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/twitter-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/break-free-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/coin-master-free-spins-link-today-new-2021_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/hack-rrobux-infinitos-en-roblox-pastebin_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/roblox-free-download_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/get-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/coin-master-free-spins-iphone_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/how-to-get-free-robux-and-tix-2021_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/roblox-how-to-get-free-gear-2021_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/como-conseguir-monedas-infinitas-y-tiradas-de-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/minecraft-that-you-can-play-for-free_GM479516143.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/roblox-strucid-hack-script_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/release-boku-no-roblox-remastered-hack_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/coin-master-hack-apk-july-2021_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_off00002f29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F29 22748 bytes
SHA-256: 30e19a83b08e50cf651f0bab26934abc32ba84620147390fef82380109ed4a59
font_01_sfnt_off00006201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6201 19452 bytes
SHA-256: 8115ccb621edd4612311f62a2018219b20574293e23f0c1b138e5e1805582403

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