Malicious PDF — malware analysis report

Static analysis result for SHA-256 a82e083bc0317d22…

MALICIOUS

PDF

46.0 KB Created: 2021-05-15 15:34:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: c42480fde74c218ef57bbec090da0493 SHA-1: 284b28d88f749e0402ebad7350d052ad1977f6de SHA-256: a82e083bc0317d22ae004058b8a101ac85c84cd7d16a11b2a1b89d4b630b7873
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting "free Robux" and "game hacks" as a lure. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the lures suggest an attempt to drive users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9628

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/431946152/free-robux-microsoft-game-hack In PDF document text
    • http://biljartenbarendrecht.nl/images/new-free-money-links-coin-master_GM406889139.pdfIn PDF document text
    • http://biljartenbarendrecht.nl/images/mobihack-net-roblox-hack_GM431946152.pdfIn PDF document text
    • http://biljartenbarendrecht.nl/images/coin-master-free-spins-april-2021_GM406889139.pdfIn PDF document text
    • http://biljartenbarendrecht.nl/images/free-roblox-injector_GM431946152.pdfIn PDF document text
    • http://biljartenbarendrecht.nl/images/coin-master-gift-hack_GM406889139.pdfIn PDF document text
    • http://biljartenbarendrecht.nl/images/free-robux-no-human-verification-generator_GM431946152.pdfIn PDF document text
    • http://biljartenbarendrecht.nl/images/moonactive-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://biljartenbarendrecht.nl/images/minecraft-windows-10-edition-hacked-client_GM479516143.pdfIn PDF document text
    • http://biljartenbarendrecht.nl/images/robux-for-offers_GM431946152.pdfIn PDF document text
    • http://biljartenbarendrecht.nl/images/robux-sites_GM431946152.pdfIn PDF document text
    • http://biljartenbarendrecht.nl/images/coin-master-hack-apk-with-fb-login-2021_GM406889139.pdfIn PDF document text
    • http://biljartenbarendrecht.nl/images/how-to-get-free-robux-on-phone-2021_GM431946152.pdfIn PDF document text
    • http://biljartenbarendrecht.nl/images/coin-master-apk-hack_GM406889139.pdfIn PDF document text
    • http://biljartenbarendrecht.nl/images/coin-master-gold-cards-free_GM406889139.pdfIn PDF document text
    • http://biljartenbarendrecht.nl/images/free-headless-head-roblox_GM431946152.pdfIn PDF document text
    • http://biljartenbarendrecht.nl/images/how-to-get-minecraft-bedrock-edition-on-pc-for-free_GM479516143.pdfIn PDF document text
    • http://biljartenbarendrecht.nl/images/coin-master-free-spins-and-coins-app-download_GM406889139.pdfIn PDF document text
    • http://biljartenbarendrecht.nl/images/give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://biljartenbarendrecht.nl/images/free-robux-that-actually-works_GM431946152.pdfIn PDF document text
    • http://biljartenbarendrecht.nl/images/com-roblox_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_off00004b10.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B10 26832 bytes
SHA-256: ff975f57bb652ae435c08d205d904cc56843641a72dad0991112bc1ed51bc129
font_01_sfnt_off00008741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8741 2824 bytes
SHA-256: bd082aa73fbb1a8b3bd2e5c998d3d8e31d1dfc71ea36f846af746f69a0d2ab7f
font_02_sfnt_off000090f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90F4 18436 bytes
SHA-256: 753f3f2a839cbba740b1165c82973d17105d10f1d8ffbf22e8371d7b58d196dd

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