Malicious PDF — malware analysis report

Static analysis result for SHA-256 19a67827bbf24175…

MALICIOUS

PDF

35.3 KB Created: 2021-06-30 11:22:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 493c552a4783c763480421e8ad8aee03 SHA-1: 7cac3b027055fdbb167a83b52485b7c043998ad8 SHA-256: 19a67827bbf2417597dde9925f7f220cbe81ffb6d1168487553afc59a26dda30
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to websites offering game hacks and free in-game currency, such as Roblox Robux and Coin Master spins. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting the document is designed to lead users to potentially harmful sites. The presence of a visual download button lure further supports a malicious workflow aimed at tricking users into clicking through to malicious content.

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.co/app/431946152/free-private-roblox-servers-game-hack In PDF document text
    • http://digilib.stie-yppi.ac.id/repository/2021-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/coin-master-hack-iphone_GM406889139.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/coin-master-hack-app-for-ios_GM406889139.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/free-robux-quick-and-easy-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/roblox-star-wars-first-order-cheat-engine_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/roblox-hack-site_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/how-to-get-roblox-premium-for-free-2021_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/free-spin-coin-master-instagram_GM406889139.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/free-offers-for-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/robloxheroxyz-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/robux-earning-websites_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/free-coin-master-coins_GM406889139.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/free-robux-without-verify_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/free-audio-uploader-for-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/get-robux-for-free-and-quickly_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/coin-master-2021-free-spins-link_GM406889139.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/minecraft-free-download-android_GM479516143.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/free-spin-link-for-coin-master-haktuts_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_off0000317c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x317C 22744 bytes
SHA-256: 517e2c0bd5fe006f984a576f1f0ff7705e91493977264847b2d43f08ce0ab0e5
font_01_sfnt_off000064b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64B3 19144 bytes
SHA-256: 82851c020c07ff3dd9a81c6aa73e01512203ff2b1ff8a05d26cae0ceb61121d7

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