Malicious PDF — malware analysis report

Static analysis result for SHA-256 90bca04d453972b7…

MALICIOUS

PDF

43.2 KB Created: 2021-05-10 21:01:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 6718519a19e6669376f222053f5651ff SHA-1: 4093514294718722f41aa0b4e77293de79ac4629 SHA-256: 90bca04d453972b74d484e1a321c2a02b5aa0722ed2099ab56096b320cc15ffa
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 / game hack" lures. The primary malicious URL identified is https://netcdn.xyz/app/406889139/free-spin-links-coin-master-2021-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a social engineering attack aimed at driving traffic to potentially harmful sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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/free-spin-links-coin-master-2021-game-hack In PDF document text
    • https://tpp.com.tw/image/data/files/coin-master-free-spins-hack-download_GM406889139.pdfIn PDF document text
    • https://tpp.com.tw/image/data/files/coin-master-free-spins-and-coins-blogspot_GM406889139.pdfIn PDF document text
    • https://tpp.com.tw/image/data/files/free-coin-master-gifts_GM406889139.pdfIn PDF document text
    • https://tpp.com.tw/image/data/files/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://tpp.com.tw/image/data/files/minecraft-free-download-ios_GM479516143.pdfIn PDF document text
    • https://tpp.com.tw/image/data/files/how-to-get-more-robux-for-free_GM431946152.pdfIn PDF document text
    • https://tpp.com.tw/image/data/files/coin-master-free-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • https://tpp.com.tw/image/data/files/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://tpp.com.tw/image/data/files/free-robux-codes-no-verification_GM431946152.pdfIn PDF document text
    • https://tpp.com.tw/image/data/files/minecraft-free-version_GM479516143.pdfIn PDF document text
    • https://tpp.com.tw/image/data/files/rewardrobux-com_GM431946152.pdfIn PDF document text
    • https://tpp.com.tw/image/data/files/best-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://tpp.com.tw/image/data/files/free-robux-groups-2021_GM431946152.pdfIn PDF document text
    • https://tpp.com.tw/image/data/files/roblox-free-no-download_GM431946152.pdfIn PDF document text
    • https://tpp.com.tw/image/data/files/google-how-do-you-get-robux_GM431946152.pdfIn PDF document text
    • https://tpp.com.tw/image/data/files/play-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • https://tpp.com.tw/image/data/files/coin-master-hack-version_GM406889139.pdfIn PDF document text
    • https://tpp.com.tw/image/data/files/coin-master-hack-apk-2021-download_GM406889139.pdfIn PDF document text
    • https://tpp.com.tw/image/data/files/how-to-get-roblox-premium-for-free-2021_GM431946152.pdfIn PDF document text
    • https://tpp.com.tw/image/data/files/mcpe-master-coin-hack-apk_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_off00004882.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4882 25704 bytes
SHA-256: 83613f679ec8fe9eb23f24425ab68f997b70babd2317fe2084b7516c133be490
font_01_sfnt_off0000821e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x821E 19784 bytes
SHA-256: 50aba124c71eabdfdcdbff0d9c79245a882ce24d8b84c58e12f36dc217deee82

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