Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ced4afd0a75b6e2…

MALICIOUS

PDF

45.2 KB Created: 2021-05-15 01:12:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 76acb9c9e7e98f876febcb8f505c71ec SHA-1: b6772b0d33d8d4fdabd9043c4a6577819dc9af9b SHA-256: 9ced4afd0a75b6e2ce1fbc57827f13d0fa1ccda12705581ecf5b052863ad236a
260 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are SEO-optimized PDF files related to game hacks and free currency. The document body and heuristics indicate a lure to trick users into clicking these links, potentially via a fake CAPTCHA or verification prompt, to download malicious content or visit redirector infrastructure. While no scripts were directly extracted, the nature of the links and the fake CAPTCHA heuristic suggest an attempt to execute further malicious actions, possibly through embedded JavaScript or by tricking the user into running downloaded executables.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9551

Heuristics 6

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/479516143/minecraft-windows-10-edition-free-with-java-game-hack In PDF document text
    • http://dejipkesbelt.nl/images/coin-master-free-spins-hack-2021_GM406889139.pdfIn PDF document text
    • http://dejipkesbelt.nl/images/coin-master-hack-apk-2021-download_GM406889139.pdfIn PDF document text
    • http://dejipkesbelt.nl/images/roblox-bloxburg-hack_GM431946152.pdfIn PDF document text
    • http://dejipkesbelt.nl/images/how-to-get-free-robux-fast-and-easy_GM431946152.pdfIn PDF document text
    • http://dejipkesbelt.nl/images/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://dejipkesbelt.nl/images/free-robux-no-anti-bot-verification_GM431946152.pdfIn PDF document text
    • http://dejipkesbelt.nl/images/coin-master-free-spins-link-2021-twitter_GM406889139.pdfIn PDF document text
    • http://dejipkesbelt.nl/images/minecraft-pe-hacks_GM479516143.pdfIn PDF document text
    • http://dejipkesbelt.nl/images/coin-free-spin_GM406889139.pdfIn PDF document text
    • http://dejipkesbelt.nl/images/free-minecraft-alt-accounts_GM479516143.pdfIn PDF document text
    • http://dejipkesbelt.nl/images/free-spins-for-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://dejipkesbelt.nl/images/coin-master-400-spin-link-today_GM406889139.pdfIn PDF document text
    • http://dejipkesbelt.nl/images/free-robux-no-verification-needed_GM431946152.pdfIn PDF document text
    • http://dejipkesbelt.nl/images/free-spins-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://dejipkesbelt.nl/images/get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://dejipkesbelt.nl/images/roblox-robux_GM431946152.pdfIn PDF document text
    • http://dejipkesbelt.nl/images/50-000-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://dejipkesbelt.nl/images/como-hackear-coin-master_GM406889139.pdfIn PDF document text
    • http://dejipkesbelt.nl/images/coin-master-free-spins-iphone_GM406889139.pdfIn PDF document text
    • http://dejipkesbelt.nl/images/bux-gg-robux-free_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_off00004a7f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A7F 24672 bytes
SHA-256: dce9787dcd710edc936c95fcbc255270e960257584ba112a6513caf73480aef5
font_01_sfnt_off0000823e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x823E 2880 bytes
SHA-256: 29ffac6ae2c225ad742d302df2deaca7764d0abb58a6f2c81d3137a4f416ba07
font_02_sfnt_off00008c2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C2C 18972 bytes
SHA-256: 6c20506a37f57d149a2d60f903306920f0d4438cf2101358cedc4e984bc12f18

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