Malicious PDF — malware analysis report

Static analysis result for SHA-256 3456ccd566329e7b…

MALICIOUS

PDF

45.9 KB Created: 2021-05-14 05:49:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 9bce916570c7f50d8972188f71a12571 SHA-1: 6f4d15b621556214a5dda742c3dda918478e6c01 SHA-256: 3456ccd566329e7bcc70d53ab9813d339d28023499cfbd3d3b9e8992c3491d5e
200 Risk Score

Malware Insights

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

The PDF document employs a fake CAPTCHA lure to deceive users into clicking a link. This link redirects to a malicious website, likely to download further malware or engage in phishing. The ML classifier also flagged this PDF as malicious, supporting the observed malicious behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

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-ftw-game-hack In PDF document text
    • http://bibliodetki.ru/images/free-robux-gen_GM431946152.pdfIn PDF document text
    • http://bibliodetki.ru/images/how-do-you-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://bibliodetki.ru/images/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://bibliodetki.ru/images/how-to-hack-coin-master-using-es-file_GM406889139.pdfIn PDF document text
    • http://bibliodetki.ru/images/how-to-hack-coin-master-with-lucky-patcher_GM406889139.pdfIn PDF document text
    • http://bibliodetki.ru/images/free-minecraft-skins-girl_GM479516143.pdfIn PDF document text
    • http://bibliodetki.ru/images/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://bibliodetki.ru/images/coin-master-free-attack_GM406889139.pdfIn PDF document text
    • http://bibliodetki.ru/images/coin-master-spins_GM406889139.pdfIn PDF document text
    • http://bibliodetki.ru/images/wurst-hacked-client_GM479516143.pdfIn PDF document text
    • http://bibliodetki.ru/images/como-hackear-coin-master-espaol_GM406889139.pdfIn PDF document text
    • http://bibliodetki.ru/images/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://bibliodetki.ru/images/free-spins-on-coin-master-without-human-verification_GM406889139.pdfIn PDF document text
    • http://bibliodetki.ru/images/free-minecraft-client_GM479516143.pdfIn PDF document text
    • http://bibliodetki.ru/images/minecraft-reach-hack_GM479516143.pdfIn PDF document text
    • http://bibliodetki.ru/images/real-roblox_GM431946152.pdfIn PDF document text
    • http://bibliodetki.ru/images/free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://bibliodetki.ru/images/how-to-generate-free-coin-master-spin_GM406889139.pdfIn PDF document text
    • http://bibliodetki.ru/images/coin-master-free-pet-food-links_GM406889139.pdfIn PDF document text
    • http://bibliodetki.ru/images/haktuts-coin-master-free-spin-link_GM406889139.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_off0000478b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x478B 27756 bytes
SHA-256: 068d0dce99d80ccd09d1263fd2cfc9602f9a4eb81b50b15daddfc51bed6dd936
font_01_sfnt_off0000872a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x872A 2828 bytes
SHA-256: db1860fd79a3f2cbe32e2bada3ba4c68a2d581b7a24294387cd777233cc9cef6
font_02_sfnt_off000090e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90E1 18216 bytes
SHA-256: 1d50de4617ba4833758eaeaefdb81b723ed2f26f16522b6b79df10ef9fbd4a9c

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