Malicious PDF — malware analysis report

Static analysis result for SHA-256 79e609329ed13244…

MALICIOUS

PDF

50.5 KB Created: 2021-06-08 10:09:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 390d36d5a2bd8369a541ed17f1aac4b2 SHA-1: 6ab482f290ef37ed61ca204b6d1dce6a87f6db1e SHA-256: 79e609329ed13244999da1397ffbc72f6fece8df66097e488a699fc2c4ee8d4a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically targeting users interested in game hacks and free in-game currency. The heuristic firings indicate that these links are part of a known malicious redirector chain. Although no scripts were explicitly extracted, the nature of the lures and the embedded URLs strongly suggest a phishing or scam attempt designed to lead users to potentially harmful content or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9779

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.tw/app/431946152/at-which-game-have-free-robux-at-roblox-game-hack In PDF document text
    • http://perpus.i2s-learning.com//repository/no-scam-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/free-girl-stuff-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/coin-master-update-2021_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/easy-ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/coin-master-hack-app-ios-download_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/free-robux-without-verify_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/how-to-get-free-chest-in-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/minecraft-free-download-android-apk-014-0_GM479516143.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/free-spins-coin-master-2021-hack_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/how-to-earn-robux_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/daily-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/blox-world-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/coin-master-apk-mod_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/prison-life-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/how-to-get-minecraft-realms-for-free_GM479516143.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/free-games-like-minecraft_GM479516143.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/bux-life-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005212.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5212 27916 bytes
SHA-256: b583d5e8c4443771ce5f25775244db27574e6eb81d6c253aff93d62e98505c51
font_01_sfnt_off000092c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92C0 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00009fd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9FD1 19276 bytes
SHA-256: 9a15df006c27081589afe91dcbed36a1540a012320795a8dc37152e57fc458d3

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