Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d870d39f2ed20c7…

MALICIOUS

PDF

43.6 KB Created: 2021-06-03 05:06:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 68cd8b2d0a24b89ae7ba2a4388630d41 SHA-1: df758c3b392e9b2144f2aa07929cc2c637a3c1d9 SHA-256: 4d870d39f2ed20c769d071a0d8550f122aaea55b0b111c3d2a15fc7fcc259920
160 Risk Score

Malware Insights

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

The PDF contains multiple links that redirect to malicious infrastructure, specifically promoting 'free generators' and 'game hacks' for popular games. The document body, though partially corrupted, contains a URL that matches the heuristic findings. The presence of embedded URLs and the nature of the lures suggest an attempt to trick users into visiting malicious sites, likely for further exploitation or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/406889139/coin-master-how-to-get-japan-sushi-card-free-game-hack In PDF document text
    • http://library.stieyapan.ac.id//repository/roblox-skins-boy-free_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-hack-september-2021_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/claim-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-hack-2021-android_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/can-you-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/all-minecraft-handbooks_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/install-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/real-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/minecraft-hack-2021_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-cards-free_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/robuxglobalcom-no-verification_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-free-coins-and-spins-app_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-money-hack_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/how-to-earn-free-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-online_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/minecraft-servers-that-allow-hacks_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/how-to-earn-robux_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-free-coins-no-human-verification_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-tool-hack_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
stream_004_off00004f7d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F7D 24264 bytes
SHA-256: ef547a45524228f115e020dd8046565b22b25e0e1e6f015f634dcb4c49d83724
font_01_sfnt_off000086ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86CA 18696 bytes
SHA-256: b658d8f1c141fc8c479f08926c8ce77f4430151ae81ac58e32bab20f08e84866

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