Malicious PDF — malware analysis report

Static analysis result for SHA-256 f79505f453d0cc58…

MALICIOUS

PDF

34.1 KB Created: 2021-07-05 19:26:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 1a632e217045e05829e1ecd8b6732b71 SHA-1: e2e5a8ba6aa296cceef608c185e36c338572546d SHA-256: f79505f453d0cc5803f694c184049053acd5812b1a050c0ebbda0bf83b283392
160 Risk Score

Malware Insights

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

The PDF document contains multiple embedded links that redirect to malicious infrastructure, specifically promoting game hacks and free currency generators. The heuristic firings indicate that these links lead to known malicious redirectors and are part of a lure for free game-related content. While no scripts were explicitly extracted, the nature of the links and the ML classification suggest a high likelihood of the document being used to deliver a malicious payload or lead users to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/cheats-for-coin-master-game-hack In PDF document text
    • http://library.stieyapan.ac.id/repository/wwwcoin-master-hack-apk_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/how-to-get-free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-hack-apk-latest-version-2021_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/how-to-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/pubg-uc-ycom_GM1330123889.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/pubg-uc-midasbuy_GM1330123889.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/getrobux-info_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/free-robux-cards_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/tiktok-free-without-downloading_GM835599320.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/www-roblox-com-robux-free_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/daily-spin-coin-master-free_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/minecraft-for-ps3-free_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-free-gift-cards_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/free-spin-link-of-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/legit-coin-master-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/generator-robux_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/make-free-robux_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/pubg-uc-carding-method-2021_GM1330123889.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-free-coins-and-spins-2021_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-free_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
font_00_sfnt_off000030e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30E7 22600 bytes
SHA-256: ef1c9870fa8fc36522838c4ce60693fc97d830e698b525f9607542deaea3b3a9
font_01_sfnt_off00006340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6340 18164 bytes
SHA-256: c315ccf9a79b36be1a03c3aee76827ab51131b40fc24ac36c1cd3f6d313de72a

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