Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a9e199dae135a08…

MALICIOUS

PDF

42.9 KB Created: 2021-05-10 17:54:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 3f52b7d402a36068e5086f22e8aa8d5d SHA-1: 4dc71a86d27fb0fbd52254d399545ded554e5b13 SHA-256: 2a9e199dae135a08f092843c87fa49b221644ffb10283a85b29fef48d6b7f48e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirectors and external URLs, masquerading as game hacks and free currency generators. The primary malicious link, https://netcdn.xyz/app/406889139/coinmaster-game-hack, is flagged as a known malicious redirector. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a social engineering attack aimed at driving users to potentially malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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.xyz/app/406889139/coinmaster-game-hack In PDF document text
    • http://hondenspecialist-engelien.nl/images/free-ways-to-get-robux_GM431946152.pdfIn PDF document text
    • http://hondenspecialist-engelien.nl/images/hack-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://hondenspecialist-engelien.nl/images/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://hondenspecialist-engelien.nl/images/minecraft-survival-hacks_GM479516143.pdfIn PDF document text
    • http://hondenspecialist-engelien.nl/images/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://hondenspecialist-engelien.nl/images/coin-master-code-for-free-spins_GM406889139.pdfIn PDF document text
    • http://hondenspecialist-engelien.nl/images/free-robux-no-verify-2021_GM431946152.pdfIn PDF document text
    • http://hondenspecialist-engelien.nl/images/coin-master-daily-free-spins-25_GM406889139.pdfIn PDF document text
    • http://hondenspecialist-engelien.nl/images/how-to-hack-roblox-games_GM431946152.pdfIn PDF document text
    • http://hondenspecialist-engelien.nl/images/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • http://hondenspecialist-engelien.nl/images/free-robux-app-real_GM431946152.pdfIn PDF document text
    • http://hondenspecialist-engelien.nl/images/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • http://hondenspecialist-engelien.nl/images/free-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://hondenspecialist-engelien.nl/images/microsoft-robux_GM431946152.pdfIn PDF document text
    • http://hondenspecialist-engelien.nl/images/roblox-generator-no-human-verification_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_003_off00004361.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4361 24936 bytes
SHA-256: 9e97b2e4c8c5feace47dd5c1557348e1663560283cd010e1aa61ea80af6731cd
font_01_sfnt_off00007bce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BCE 3400 bytes
SHA-256: 4b3e0f36ad1e0c7e3ea5c178fd2b4f097d1e01575fc6a4101a8b520db34dfe07
font_02_sfnt_off000086f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86F7 17808 bytes
SHA-256: af208cdb45bd073d7b5ba90b2b5d7fe18c625e7bd90d48e59b2ee82d337b8146

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