Malicious PDF — malware analysis report

Static analysis result for SHA-256 05f49b275353d1a5…

MALICIOUS

PDF

42.4 KB Created: 2021-05-11 13:30:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 84388ce4be030cccbb2eebd2ceea5ad9 SHA-1: 62eb48e3f8b6067a3f8bced581c8050621048934 SHA-256: 05f49b275353d1a5f9ccf8c97387ece5b7f98a6cba63e1ea3eb7561946938d0f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically promoting 'free generator' or 'game hack' lures. The document body, though heavily obfuscated, contains references to these lures and embedded URLs. The primary attack pattern involves tricking the user into visiting a malicious URL, likely to download further malware or engage in credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/how-to-get-free-robux-on-android-game-hack In PDF document text
    • http://huebner-baustoffe.de/images/how-to-get-more-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/coin-master-apk-hack-3527_GM406889139.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/how-to-get-real-robux_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/free-roblox-intros_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/codes-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/free-robux-codes-no-human-verification_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/coin-master-hack-apk_GM406889139.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/300-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/free-roblox-hair-to-wear_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/get-more-robux_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/moonactive-free-spins-link_GM406889139.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/free-roblox-followers_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/coin-master-code-hack_GM406889139.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/free-robux-with-no-human-verification_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/how-to-gift-robux-on-mobile_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/coin-master-daily-free-spins-link-today-blogspot_GM406889139.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/roblox-free-wings_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/best-free-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/free-minecraft-account-and-password-2021_GM479516143.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_off00004bbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4BBB 24040 bytes
SHA-256: 7c12d984aeff36125f2d435218ba69d3422a827278cc8f608664e50be694c0f1
font_01_sfnt_off00008282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8282 18576 bytes
SHA-256: be12fe34256d848f1a7db569f7882c3333b0548de7731ecd127307da0fa566a6

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