Malicious PDF — malware analysis report

Static analysis result for SHA-256 5de978c31693c817…

MALICIOUS

PDF

42.3 KB Created: 2021-05-16 09:19:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: ee54a9ee78500fd3df7e20f9f66e0f18 SHA-1: 74d39fbed761d9c8bfce4451f38b68c06354ae0a SHA-256: 5de978c31693c81742ced27665c9dce5d9910edda6590fb186221cde0683b1da
200 Risk Score

Malware Insights

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

The PDF document contains links to malicious redirectors, masquerading as game hacks or generators, to trick users into downloading further malware. The document body and heuristics indicate a lure for fake CAPTCHA or human verification, likely to facilitate the execution of a second-stage payload. No scripts were extracted, but the presence of embedded URLs and the nature of the lure suggest a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/how-to-make-a-private-server-on-roblox-for-free-game-hack In PDF document text
    • https://www.linzgau-kjh.de/images/coin-master-coins-free_GM406889139.pdfIn PDF document text
    • https://www.linzgau-kjh.de/images/roblox-hack-download_GM431946152.pdfIn PDF document text
    • https://www.linzgau-kjh.de/images/wurst-112-2_GM479516143.pdfIn PDF document text
    • https://www.linzgau-kjh.de/images/spinuri-gratis-coin-master_GM406889139.pdfIn PDF document text
    • https://www.linzgau-kjh.de/images/robuxy-com-free-robux_GM431946152.pdfIn PDF document text
    • https://www.linzgau-kjh.de/images/free-spin-app-coin-master_GM406889139.pdfIn PDF document text
    • https://www.linzgau-kjh.de/images/free-robux-app_GM431946152.pdfIn PDF document text
    • https://www.linzgau-kjh.de/images/robloxfun-com-robux_GM431946152.pdfIn PDF document text
    • https://www.linzgau-kjh.de/images/free-roblox-hack-us_GM431946152.pdfIn PDF document text
    • https://www.linzgau-kjh.de/images/worst-roblox-avatars_GM431946152.pdfIn PDF document text
    • https://www.linzgau-kjh.de/images/coin-master-spins_GM406889139.pdfIn PDF document text
    • https://www.linzgau-kjh.de/images/hack-coin-master-online-without-human-verification_GM406889139.pdfIn PDF document text
    • https://www.linzgau-kjh.de/images/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.linzgau-kjh.de/images/how-to-change-your-name-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://www.linzgau-kjh.de/images/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • https://www.linzgau-kjh.de/images/roblox-old-avatar_GM431946152.pdfIn PDF document text
    • https://www.linzgau-kjh.de/images/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • https://www.linzgau-kjh.de/images/roblox-scam_GM431946152.pdfIn PDF document text
    • https://www.linzgau-kjh.de/images/how-to-play-minecraft-with-friends-for-free_GM479516143.pdfIn PDF document text
    • https://www.linzgau-kjh.de/images/how-to-hack-roblox-accounts-for-robux_GM431946152.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_off00004693.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4693 25112 bytes
SHA-256: e6007b0a939416babd5db3af9f66fb9deda007482f4bdf2cdccb19f8ca4a6eb5
font_01_sfnt_off00008073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8073 19196 bytes
SHA-256: b86313febfc454b426d55667776bc2f57fbcac051d8b12890de5d5336413d825

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