Malicious PDF — malware analysis report

Static analysis result for SHA-256 16388a7d7110e318…

MALICIOUS

PDF

32.6 KB Created: 2021-07-05 12:22:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 7a7db6724ac47bcd4bf997b8529f81ee SHA-1: b93a12b52e54d894b4b3cc366b8cf701d6101a28 SHA-256: 16388a7d7110e3186b0b16736f48a0e4ca12e5a80ff30fb5c4b74de9f94b40b1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common lure of free game hacks and generators to trick users into clicking malicious links. The document contains multiple embedded URLs that lead to redirectors and potentially malicious content, including a primary link to 'netcdn.tw'. The ML classifier also flagged this PDF as malicious, supporting the observed malicious redirection and lure techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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 http://netcdn.tw/app/406889139/coin-master-village-3-game-hack In PDF document text
    • http://cintabaca.org/katalog//repository/coin-master-hack-online-generator-without-human-verification_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/coin-master-free-coins-cheat_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/roblox-accounts-getting-hacked_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/red-cropped-top-and-ripped-jeans-roblox-outfit-free_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/coin-master-hack-apk-latest-version-2021_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/minecraft-free-download-mac-full-version_GM479516143.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/mcpe-com_GM479516143.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/minecraft-games-free-download_GM479516143.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/how-to-get-more-robux-for-free_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/blogspot-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/free-robux-games-that-actually-work_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/coin-master-free-spins-twitter_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/how-to-hack-filtering-enabled-games-roblox_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/coin-master-hack-2021-ios_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/free-robux-groups-2021_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/free-robux-limited-time-game_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/coinmaster-spin-ml_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/minecraft-java-free-account_GM479516143.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/coin-master-codes_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
font_00_sfnt_off00002ac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2AC7 22516 bytes
SHA-256: 71bcfbe6752cb1e000aa7f4f23f001d1d9cbac5a851ddb5659dc5c7f638cd35c
font_01_sfnt_off00005d25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D25 18216 bytes
SHA-256: 013099061882cabe4a5b28fedff039c183f142ba80ad6529ed5e41c5d5229a73

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