Malicious PDF — malware analysis report

Static analysis result for SHA-256 79d1ca3279c0d92f…

MALICIOUS

PDF

44.6 KB Created: 2021-06-04 03:35:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: aca889354a1b412d96099567cd36018a SHA-1: 901d0213101b5a44df9de1d1b8b75d39cb466860 SHA-256: 79d1ca3279c0d92f31a362eb674154a4da2343c8bd094ca6add244ddcc347eba
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to a website offering 'free generators' for games, a common lure for malicious content. The ML classifier also flagged this PDF as malicious. The document body, though heavily obfuscated, contains references to the malicious URL, reinforcing the phishing attempt.

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-spin-ml-game-hack In PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/hackear-juego-coin-master-espaol_GM406889139.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/coin-master-daily-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/how-to-get-minecraft-for-free-on-iphone_GM479516143.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/free-robux-android_GM431946152.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/best-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/minecraft-texture-packs-free-download_GM479516143.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/uprobuxcom-free-robux_GM431946152.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/how-to-get-free-spins-on-coin-master-without-waiting_GM406889139.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/coin-master-free-spin-2912-2021_GM406889139.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/minecraft-pc-download-free-full-version_GM479516143.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/can-you-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/game-toolbox_GM479516143.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/pig-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/pokemon-go-free-100-iv-map_GM1094591345.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/free-robux-gift-card-generator_GM431946152.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/robux-com-free-robux_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_off00005300.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5300 25376 bytes
SHA-256: 8227b60e78ffbbd92004816b7d7b2a03009479d06a5694bdb2218bb6943ce4e0
font_01_sfnt_off00008d41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D41 17796 bytes
SHA-256: 3b82762977221ce4a8aa4f34a999f4b9b1a52ddbe80fdd6ab7df254e8a1ed8c9

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