Malicious PDF — malware analysis report

Static analysis result for SHA-256 38cfed7a0b85ef83…

MALICIOUS

PDF

44.8 KB Created: 2021-05-11 08:37:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: ddadbc723b2347ef5994c61ff565c873 SHA-1: 9614d7a00a1ebafdd1714ef1e6c25c8c1a0d4e33 SHA-256: 38cfed7a0b85ef834c7e405d10293f8b28dfd6d17d16d1b0329c80a5edcb8f6b
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and websites advertising game hacks and free generators, such as 'coin master free spins'. The presence of a fake CAPTCHA heuristic further suggests a user interaction lure designed to trick the user into clicking these links. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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/406889139/coin-master-free-spins-link-blogspot-game-hack In PDF document text
    • http://technologicalsc.com/images/free-spins-coin-master-daily_GM406889139.pdfIn PDF document text
    • http://technologicalsc.com/images/best-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://technologicalsc.com/images/free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://technologicalsc.com/images/free-100-robux_GM431946152.pdfIn PDF document text
    • http://technologicalsc.com/images/minecraft-hack-2021_GM479516143.pdfIn PDF document text
    • http://technologicalsc.com/images/moonactive-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://technologicalsc.com/images/free-minecraft-games-for-kids_GM479516143.pdfIn PDF document text
    • http://technologicalsc.com/images/coin-master-latest-version-hack_GM406889139.pdfIn PDF document text
    • http://technologicalsc.com/images/how-to-get-free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • http://technologicalsc.com/images/earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • http://technologicalsc.com/images/get-robux-com_GM431946152.pdfIn PDF document text
    • http://technologicalsc.com/images/give-free-robux_GM431946152.pdfIn PDF document text
    • http://technologicalsc.com/images/free-coin-master-spin-app_GM406889139.pdfIn PDF document text
    • http://technologicalsc.com/images/free-spins-for-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://technologicalsc.com/images/roblox-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://technologicalsc.com/images/roblox-group-free-robux_GM431946152.pdfIn PDF document text
    • http://technologicalsc.com/images/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • http://technologicalsc.com/images/free-robux-rewards_GM431946152.pdfIn PDF document text
    • http://technologicalsc.com/images/roblox-army-robux_GM431946152.pdfIn PDF document text
    • http://technologicalsc.com/images/www-bandicam-com-free-robux_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_off0000498d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x498D 24512 bytes
SHA-256: 4b4096fd531bf03c66c4cbda321451316bc58a1a477f6ed6dc17218b83883a94
font_01_sfnt_off00008187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8187 2896 bytes
SHA-256: c1a618813a64314343402b2ec738fc11c4c912460a4c7ae3029924d2f9a229cd
font_02_sfnt_off00008b6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B6D 18632 bytes
SHA-256: bdbf3986ec68ee3b496ae89412d1d0f392e3b826f1ca321ec58289079c9e4546

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