Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4dc0fce589d0403…

MALICIOUS

PDF

47.6 KB Created: 2021-06-03 05:04:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 415e7a834babb247b488eb6739fedeab SHA-1: 8665e828dfed5e0be18d7b52232904b6625b121b SHA-256: a4dc0fce589d04037c9b8d3a4752cbead6c887a0c14a408f9345229e3db36f82
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains multiple links to known malicious redirectors and lures users with a fake CAPTCHA to trick them into clicking a link. The primary link leads to a "free generator / game hack" website, suggesting a scam or phishing attempt. No scripts were extracted, but the document's structure and embedded URLs strongly indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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-hack-com-game-hack In PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-apk-mod_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/free-robux-earn_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/roblox-inappropriate-games_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/public-enemy-sun-prairie-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-get-free-robux-in-2021_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-hack-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/freegames911com-coinmastertipsandcheats2021freecoinsandspins_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-hack-android_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-login-hack_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/pubg-uc-100_GM1330123889.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/cmaster-club-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-coin-and-spin-for-coin-master_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-girl_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/earn-roblox_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/hey-google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/rbx-hut-promo-codes_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-get-free-cards-sets-for-coin-master_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-robux_GM431946152.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_off000052d0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52D0 25788 bytes
SHA-256: 91be0ab711f2f6d24b1224c9ff853b3e530e49d6bce125d9a2039392ed7ed5a2
font_01_sfnt_off00008d67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D67 3204 bytes
SHA-256: b7fe42cb1da39e96c756399b3532633df029c1fbb3443b9e17d98df25c90dc65
font_02_sfnt_off0000986b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x986B 17976 bytes
SHA-256: 45fb09c74bd87b01c52ca74746e6a63f33f4f39ca5a35778be362b225ed307d2

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