Malicious PDF — malware analysis report

Static analysis result for SHA-256 2607229c9adba0e9…

MALICIOUS

PDF

35.1 KB Created: 2021-07-05 21:31:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 13b60b0be6d875130b8ecf0806ac8dd0 SHA-1: 4eae65b06cd6b5377cdfb2cb444f2fa63bba48f6 SHA-256: 2607229c9adba0e92fe3a9182cad3433b12c73cc8992daab69d76d1ceff50892
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a malformed stream and a critical heuristic firing indicates it links to a known malicious redirector. The document body and embedded URLs promote game hacks and virtual currency, suggesting a lure for users to click the malicious link. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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/where-can-i-get-free-coins-for-coin-master-game-hack In PDF document text
    • https://www.sonestad.se/library/repository/a-group-that-give-u-free-robux_GM431946152.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/free-robux-groups-2021_GM431946152.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/coin-master-free-spins-and-coins-link-haktuts_GM406889139.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/minecraft-servers-that-allow-hacks_GM479516143.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/coin-master-free-gold-cards_GM406889139.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/coin-master-mod-version-free-download-34-4_GM406889139.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/roblox-sign-in-free_GM431946152.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/how-do-you-hack-minecraft_GM479516143.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/how-to-download-minecraft-for-free-on-iphone_GM479516143.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/coin-master-hack-2021-app_GM406889139.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/roblox-www-com_GM431946152.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/how-to-get-free-robux-on-roblox-ios_GM431946152.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/coin-master-apk-hack_GM406889139.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/pokemon-go-free-license-key_GM1094591345.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/coin-master-free-link-2021_GM406889139.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/free-roblox-shirt-templates-2021_GM431946152.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/how-to-hack-a-minecraft-account_GM479516143.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/free-minecraft-videos_GM479516143.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/freerobux-hack-us_GM431946152.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/free-online-spins-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
font_00_sfnt_off000032e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32E1 22988 bytes
SHA-256: afbdf64cf0f0f160ca35c732a5c78c5a08465e2fed64e3194496983680592b92
font_01_sfnt_off0000667b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x667B 18360 bytes
SHA-256: c8dfeb0eef3fc723180845c5cf074af1342c80af6259c5e1d52ca41750db4653

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