Malicious PDF — malware analysis report

Static analysis result for SHA-256 8686d0431fdd58d0…

MALICIOUS

PDF

47.2 KB Created: 2021-06-10 22:27:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 9f53ea4a8512a58cc446c845a5e88fae SHA-1: a84335dfd40d96c2be9ffd4e74e418e3e60b874f SHA-256: 8686d0431fdd58d0fb1eb109cd42f5c88bb70a096b4a2eaa572e8844397440d5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free generator' or 'game hack' lures. The primary redirector URL is https://netcdn.tw/app/431946152/how-to-get-free-robux-2021-easy-game-hack. This indicates a social engineering tactic to trick users into visiting potentially harmful sites. No scripts were extracted, but the embedded links and heuristic firings strongly suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

Heuristics 4

  • 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.
  • 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-to-get-free-robux-2021-easy-game-hack In PDF document text
    • https://www.elevage-chiot.fr/images/coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.elevage-chiot.fr/images/coin-master-free-chest-link_GM406889139.pdfIn PDF document text
    • https://www.elevage-chiot.fr/images/free-pokemon-brick-bronze-beta-camino-4-roblox_GM431946152.pdfIn PDF document text
    • https://www.elevage-chiot.fr/images/free-robux-earn_GM431946152.pdfIn PDF document text
    • https://www.elevage-chiot.fr/images/cute-roblox-clothes-free_GM431946152.pdfIn PDF document text
    • https://www.elevage-chiot.fr/images/hack-robux_GM431946152.pdfIn PDF document text
    • https://www.elevage-chiot.fr/images/minecraft-bedrock-edition-pc-download-free_GM479516143.pdfIn PDF document text
    • https://www.elevage-chiot.fr/images/minecraft-toys-for-free_GM479516143.pdfIn PDF document text
    • https://www.elevage-chiot.fr/images/moonactive-free-spins-link_GM406889139.pdfIn PDF document text
    • https://www.elevage-chiot.fr/images/robux-no-survey_GM431946152.pdfIn PDF document text
    • https://www.elevage-chiot.fr/images/hack-coin-master-no-verification_GM406889139.pdfIn PDF document text
    • https://www.elevage-chiot.fr/images/free-tiktok-followers-no-verification-or-survey_GM835599320.pdfIn PDF document text
    • https://www.elevage-chiot.fr/images/free-robux-websites-that-actually-work_GM431946152.pdfIn PDF document text
    • https://www.elevage-chiot.fr/images/how-to-get-free-robux-easy-2021_GM431946152.pdfIn PDF document text
    • https://www.elevage-chiot.fr/images/coin-master-hack-link_GM406889139.pdfIn PDF document text
    • https://www.elevage-chiot.fr/images/get-free-tiktok-followers_GM835599320.pdfIn PDF document text
    • https://www.elevage-chiot.fr/images/how-to-get-free-robux-gift-cards_GM431946152.pdfIn PDF document text
    • https://www.elevage-chiot.fr/images/daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.elevage-chiot.fr/images/how-to-get-java-minecraft-free_GM479516143.pdfIn PDF document text
    • https://www.elevage-chiot.fr/images/free-robux-images_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_004_off00005386.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5386 27924 bytes
SHA-256: 04657283f356449e8e8b506460370e59f24cdec95a244a6c9950d9565e7929a0
font_01_sfnt_off0000939a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x939A 19092 bytes
SHA-256: cc4041fc50bd2ea9a1268967e32916156e3a634973a216864dd7f220ceb04504

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