Malicious PDF — malware analysis report

Static analysis result for SHA-256 a283b2abf2e37236…

MALICIOUS

PDF

34.1 KB Created: 2021-06-27 21:54:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 7015ebf4da36fee932a9dfe6e8500f47 SHA-1: 2c5e8485262247ac6405d55a281794f284dada59 SHA-256: a283b2abf2e3723629c31c670807220f9b973469e416a099f35d076b0a8d9325
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous links designed to lure users into clicking on promises of free game currency or hacks. It redirects to a malicious infrastructure that hosts a large number of SEO-optimized links, likely leading to further scam pages or malware downloads. The ML classifier strongly indicated maliciousness, and the heuristics point to a redirector and link farm used for malicious purposes.

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-robux-website-not-a-scam-or-fake-game-hack In PDF document text
    • http://perpus.masda.ac.id//repository/coin-master-hack-apk-iphone_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/can-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/roblox-hack-tool_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/free-tiktok-followers_GM835599320.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/coin-master-hack-without-verification-code_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/who-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/free-tiktok-likes-2021_GM835599320.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/free-coins-and-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/how-to-get-free-skins-in-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/how-can-you-hack-roblox-gamepasses_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/cmo-hackear-a-la-gente-en-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/when-you-you-download-roblox-is-it-free_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/coin-master-free-spins-hack-but-no-surveys_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/prisonj-life-hacks-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/minecraft-mod-updater_GM479516143.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/how-to-get-a-cape-in-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/how-t9-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/pokemon-go-free-gift-codes_GM1094591345.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_off00002ec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EC7 21716 bytes
SHA-256: c6f14ab90397c43a271b328d09fa97f28942d3985a87c13d89d099353f558193
font_01_sfnt_off00005eb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EB0 19568 bytes
SHA-256: e4b8001123e6c6835907e2cb3c667cf1cd933e131f64ba1ac9fcb74c994be73f

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