Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9cf1375b1a7027e…

MALICIOUS

PDF

41.7 KB Created: 2021-05-15 23:45:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 51456ca2150ce60939f9bb6ce74c2a29 SHA-1: 5db642258e4ac78380c6a5d0bf5233fb14769ed2 SHA-256: b9cf1375b1a7027edb7303e5dc10f416b978e9af313863d5362cf811e42e9808
260 Risk Score

Malware Insights

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

The PDF contains multiple links to external sites, including a known malicious redirector, disguised as "game hacks" and "free generators". The document also displays a fake CAPTCHA to trick users into interacting with these links. The presence of numerous SEO-optimized PDF links suggests a link farm designed to drive traffic to malicious or scam-related content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/406889139/hack-coin-master-2021-pc-game-hack In PDF document text
    • http://www.alsultantrading.ae/userfiles/files/coin-master-daily-free-spins-link-today-twitter_GM406889139.pdfIn PDF document text
    • http://www.alsultantrading.ae/userfiles/files/how-to-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • http://www.alsultantrading.ae/userfiles/files/coin-master-free-spins-link-2021-no-verification-deutsch_GM406889139.pdfIn PDF document text
    • http://www.alsultantrading.ae/userfiles/files/coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • http://www.alsultantrading.ae/userfiles/files/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.alsultantrading.ae/userfiles/files/aternos-free-minecraft-server_GM479516143.pdfIn PDF document text
    • http://www.alsultantrading.ae/userfiles/files/free-spin-coin-master-apk_GM406889139.pdfIn PDF document text
    • http://www.alsultantrading.ae/userfiles/files/free-games-like-roblox_GM431946152.pdfIn PDF document text
    • http://www.alsultantrading.ae/userfiles/files/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.alsultantrading.ae/userfiles/files/where-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.alsultantrading.ae/userfiles/files/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://www.alsultantrading.ae/userfiles/files/free-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • http://www.alsultantrading.ae/userfiles/files/how-can-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.alsultantrading.ae/userfiles/files/original-roblox_GM431946152.pdfIn PDF document text
    • http://www.alsultantrading.ae/userfiles/files/best-free-minecraft-skins_GM479516143.pdfIn PDF document text
    • http://www.alsultantrading.ae/userfiles/files/minecraft-free-online-games_GM479516143.pdfIn PDF document text
    • http://www.alsultantrading.ae/userfiles/files/coin-master-hack-ios-no-human-verification_GM406889139.pdfIn PDF document text
    • http://www.alsultantrading.ae/userfiles/files/coin-master-game-free-download_GM406889139.pdfIn PDF document text
    • http://www.alsultantrading.ae/userfiles/files/freespinandcoin-blogspot_GM406889139.pdfIn PDF document text
    • http://www.alsultantrading.ae/userfiles/files/pixies-gigantic-coin-master-free-spins-and-coins_GM406889139.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
stream_003_off00004970.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4970 24116 bytes
SHA-256: 967e78edcf678158da8b7e6164a90bc53f372966e800ee61d8b38dfabb8d8261
font_01_sfnt_off0000806e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x806E 18272 bytes
SHA-256: 8f307cdc696a3c0f8826b97bc83261752f53ae34b16e8994a9d0994350048eb4

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