Malicious PDF — malware analysis report

Static analysis result for SHA-256 edbe4518dee59c9c…

MALICIOUS

PDF

44.7 KB Created: 2021-05-12 09:32:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 1878b0aade4846c02d7b79f2cbbac13f SHA-1: 314261d7fca96d21d49fc95e902f82b985537170 SHA-256: edbe4518dee59c9ca9315c0ab17520f223b03ce446559b44e0831db8f987918f
200 Risk Score

Malware Insights

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

The PDF document contains multiple links to malicious redirectors and lures the user with a fake CAPTCHA, likely to trick them into downloading or executing a second-stage payload. The primary malicious URL identified is https://netcdn.xyz/app/431946152/roblox-rape-hack-game-hack, which is associated with game hack lures. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest an attempt to exploit user interaction for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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.xyz/app/431946152/roblox-rape-hack-game-hack In PDF document text
    • http://torkelson.se/images/how-to-get-minecraft-on-chromebook-for-free_GM479516143.pdfIn PDF document text
    • http://torkelson.se/images/free-spin-coin-master-app-download_GM406889139.pdfIn PDF document text
    • http://torkelson.se/images/how-do-you-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://torkelson.se/images/get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://torkelson.se/images/coin-master-free-spin-daily-link_GM406889139.pdfIn PDF document text
    • http://torkelson.se/images/minecraft-pe-hack-client-ios_GM479516143.pdfIn PDF document text
    • http://torkelson.se/images/picture-roblox_GM431946152.pdfIn PDF document text
    • http://torkelson.se/images/coin-master-links-free-spins_GM406889139.pdfIn PDF document text
    • http://torkelson.se/images/how-to-get-java-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://torkelson.se/images/free-minecraft-skins-girl_GM479516143.pdfIn PDF document text
    • http://torkelson.se/images/free-coin-master-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://torkelson.se/images/daily-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://torkelson.se/images/ww-robux_GM431946152.pdfIn PDF document text
    • http://torkelson.se/images/cool-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://torkelson.se/images/need-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://torkelson.se/images/coin-master-free-spins-and-coins-for-today_GM406889139.pdfIn PDF document text
    • http://torkelson.se/images/free-robux-codes_GM431946152.pdfIn PDF document text
    • http://torkelson.se/images/freespins-coin-master_GM406889139.pdfIn PDF document text
    • http://torkelson.se/images/roblox-imagine_GM431946152.pdfIn PDF document text
    • http://torkelson.se/images/free-robux-apps-that-work_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_off00004955.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4955 24608 bytes
SHA-256: d5aa7d1bb4b8a88f06a29f95e6853d720d588fba4281028b453186f8500ded07
font_01_sfnt_off00008205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8205 2820 bytes
SHA-256: d88f25cfe237a714f996150a11dd8a058f0f7c3e9d1ae91c17b46c10409b6c0b
font_02_sfnt_off00008b9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B9F 18356 bytes
SHA-256: 8a1fe0c7231104fca4fa627868bae52978e90e92fc8d209bfe3611444447d27b

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