Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fdac8bff02bbccc…

MALICIOUS

PDF

41.6 KB Created: 2021-05-12 21:06:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 4a6a14398349c5ce1bd951d1a0094d90 SHA-1: 34378e667c25cb244d015cbf8bd7ce25ed6b4cfc SHA-256: 8fdac8bff02bbcccd7279e3fda2452f96773c3a58a6b3a091f363b5eb949b08f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, disguised as "game hacks" and "generators" for popular games. The primary lure is a "Coin Master Links For Today" theme, directing users to `https://netcdn.xyz/app/406889139/coin-master-links-for-today-game-hack`. The document body and embedded URLs suggest a phishing or scam attempt to drive traffic to potentially malicious sites. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/406889139/coin-master-links-for-today-game-hack In PDF document text
    • https://gzog.pl/images/coin-master-games-download-free_GM406889139.pdfIn PDF document text
    • https://gzog.pl/images/free-coin-master-coins-and-spins_GM406889139.pdfIn PDF document text
    • https://gzog.pl/images/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://gzog.pl/images/robux-game-com_GM431946152.pdfIn PDF document text
    • https://gzog.pl/images/free-spin-link-in-coin-master-game_GM406889139.pdfIn PDF document text
    • https://gzog.pl/images/free-robux-codes-no-verification_GM431946152.pdfIn PDF document text
    • https://gzog.pl/images/collect-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://gzog.pl/images/promo-code-free-robux_GM431946152.pdfIn PDF document text
    • https://gzog.pl/images/coin-master-400-spin-link_GM406889139.pdfIn PDF document text
    • https://gzog.pl/images/coin-master-free-spins-without-human-verification_GM406889139.pdfIn PDF document text
    • https://gzog.pl/images/rbxoffers-com-free-robux_GM431946152.pdfIn PDF document text
    • https://gzog.pl/images/roblox-sign-in-free_GM431946152.pdfIn PDF document text
    • https://gzog.pl/images/how-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://gzog.pl/images/coinmaster-free-cards_GM406889139.pdfIn PDF document text
    • https://gzog.pl/images/free-minecraft-java-edition-codes_GM479516143.pdfIn PDF document text
    • https://gzog.pl/images/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • https://gzog.pl/images/roblox-royale-high-diamond-hack_GM431946152.pdfIn PDF document text
    • https://gzog.pl/images/free-robux-hack-generator_GM431946152.pdfIn PDF document text
    • https://gzog.pl/images/hack-coin-master-apk-32_GM406889139.pdfIn PDF document text
    • https://gzog.pl/images/can-you-hack-coin-master_GM406889139.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_off00004807.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4807 24584 bytes
SHA-256: e7b2de9a3f7e396dae2680ca4ced4197580091272ce7d2bda5421ab0251fe75e
font_01_sfnt_off0000803c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x803C 18232 bytes
SHA-256: 79bece74db2dd822c76612a1664280e186053a2a893c50b912a800105546df15

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