Malicious PDF — malware analysis report

Static analysis result for SHA-256 24ad6fe89f05f3e3…

MALICIOUS

PDF

52.7 KB Created: 2021-06-07 08:26:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 009f70235993738282c4574c600fa50d SHA-1: ab314c3afa03bbbac99999832f21d69563a02a9a SHA-256: 24ad6fe89f05f3e3fa7318a11c84f40884e76feccec0a2a79ae05da7b59d7d27
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document employs a fake CAPTCHA lure to trick users into clicking a malicious link, which is identified as a known redirector infrastructure. The document's content and embedded URLs suggest a social engineering attempt to lead users to potentially harmful websites, likely for credential harvesting or malware distribution. No scripts were extracted, but the PDF structure and embedded URLs are sufficient to infer a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9614

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.tw/app/431946152/how-do-you-get-free-robux-without-pastibein-raw-game-hack In PDF document text
    • https://newenglandafs.com/images/i-got-hacked-on-roblox_GM431946152.pdfIn PDF document text
    • https://newenglandafs.com/images/minecraft-marketplace-free_GM479516143.pdfIn PDF document text
    • https://newenglandafs.com/images/how-to-get-free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • https://newenglandafs.com/images/instantrobux_GM431946152.pdfIn PDF document text
    • https://newenglandafs.com/images/free-robux-codes-2021-real_GM431946152.pdfIn PDF document text
    • https://newenglandafs.com/images/free-robux-accounts_GM431946152.pdfIn PDF document text
    • https://newenglandafs.com/images/all-free-items-in-roblox_GM431946152.pdfIn PDF document text
    • https://newenglandafs.com/images/free-robux-codes_GM431946152.pdfIn PDF document text
    • https://newenglandafs.com/images/coin-master-free-coins-hack_GM406889139.pdfIn PDF document text
    • https://newenglandafs.com/images/mcpe-116_GM479516143.pdfIn PDF document text
    • https://newenglandafs.com/images/free-minecraft-capes-no-mods_GM479516143.pdfIn PDF document text
    • https://newenglandafs.com/images/can-you-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • https://newenglandafs.com/images/get-tiktok-followers-free_GM835599320.pdfIn PDF document text
    • https://newenglandafs.com/images/haktuts-coin-master-free-spin-today_GM406889139.pdfIn PDF document text
    • https://newenglandafs.com/images/roblox-virus-free_GM431946152.pdfIn PDF document text
    • https://newenglandafs.com/images/coin-master-unlimited-coins-hack-apk-download_GM406889139.pdfIn PDF document text
    • https://newenglandafs.com/images/hack-para-tener-robux-gratis_GM431946152.pdfIn PDF document text
    • https://newenglandafs.com/images/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • https://newenglandafs.com/images/minecraft-clipart-free_GM479516143.pdfIn PDF document text
    • https://newenglandafs.com/images/coin-master-34-6-hack_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_004_off000053d5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x53D5 25536 bytes
SHA-256: 66f5f554af8c572b96af2d37d9540880855a44d06076f7196c250fdaeb01a89f
font_01_sfnt_off00008fd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FD6 7420 bytes
SHA-256: 0b188308ab0e7ffce9913d63d697a586f2937cafc51a771db38e3a566cd37e24
font_02_sfnt_off0000a845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA845 19480 bytes
SHA-256: 00b156c2eb78299be1eddb5be294925842d4ba5d0f39c809e0de4dee96673fc0

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