Malicious PDF — malware analysis report

Static analysis result for SHA-256 25017a0d5d54d5bc…

MALICIOUS

PDF

47.5 KB Created: 2021-06-11 09:34:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 33bd78278a18be314c72f30b0c85b2e7 SHA-1: daa26e6a3769fc13ebc65d363919241aed9f6d84 SHA-256: 25017a0d5d54d5bc3c6e029ce96097c8637547eeab1e87cb0b2f6c5ef1f14ef9
260 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external sites, many of which are part of a link farm designed for SEO manipulation. The primary lure appears to be a fake CAPTCHA or human verification prompt, directing users to game hack generators. The presence of embedded URLs and the overall structure suggest an attempt to redirect users to malicious or scam-related content, likely as part of a phishing or social engineering campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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.tw/app/431946152/cheat-codes-for-dayz-roblox-game-hack In PDF document text
    • https://fordogtrainers.mx:443/images/twitter-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • https://fordogtrainers.mx:443/images/irobux-com-redeem_GM431946152.pdfIn PDF document text
    • https://fordogtrainers.mx:443/images/coin-master-links-to-free-spins_GM406889139.pdfIn PDF document text
    • https://fordogtrainers.mx:443/images/how-to-get-free-robux-on-chromebook_GM431946152.pdfIn PDF document text
    • https://fordogtrainers.mx:443/images/free-card-collection-in-coin-master_GM406889139.pdfIn PDF document text
    • https://fordogtrainers.mx:443/images/free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://fordogtrainers.mx:443/images/free-minecraft-server-maker_GM479516143.pdfIn PDF document text
    • https://fordogtrainers.mx:443/images/how-to-get-free-daily-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://fordogtrainers.mx:443/images/how-to-get-roblox-premium-for-free-2021_GM431946152.pdfIn PDF document text
    • https://fordogtrainers.mx:443/images/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • https://fordogtrainers.mx:443/images/how-to-get-minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • https://fordogtrainers.mx:443/images/robux-best_GM431946152.pdfIn PDF document text
    • https://fordogtrainers.mx:443/images/free-daily-coin-master-coins_GM406889139.pdfIn PDF document text
    • https://fordogtrainers.mx:443/images/free-robux-no-human-verification-and-no-survey_GM431946152.pdfIn PDF document text
    • https://fordogtrainers.mx:443/images/free-robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • https://fordogtrainers.mx:443/images/free-spins-in-coin-master-without-human-verification_GM406889139.pdfIn PDF document text
    • https://fordogtrainers.mx:443/images/how-to-get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://fordogtrainers.mx:443/images/how-to-get-free-robux-and-tix_GM431946152.pdfIn PDF document text
    • https://fordogtrainers.mx:443/images/coin-master-real-free-spins_GM406889139.pdfIn PDF document text
    • https://fordogtrainers.mx:443/images/free-robux-without-offers_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
font_00_sfnt_off00004ecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4ECC 24720 bytes
SHA-256: 3a92b7e61ebaacb0cebe78175a73f2fefaaf1c234c7e4cfdbf7790e94c781d46
font_01_sfnt_off0000873c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x873C 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off0000944e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x944E 19052 bytes
SHA-256: e7a86869d0372724459f7028c7eab2e004d5e06bf5da136e5c1f204c6d7c8f4c

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