Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5a1d6699468ca69…

MALICIOUS

PDF

50.5 KB Created: 2021-06-08 20:46:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 74cf9c6a13a41e925f936c03a14fc2bb SHA-1: 1ec5c442119bc3279f776e5ee07b028cef220957 SHA-256: f5a1d6699468ca699ffc89259ca127077dd72e2625735449b06aa4b17b30db17
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links designed to lure users with game hack and generator promises, redirecting to a link farm of other PDFs. The ML classifier strongly indicated maliciousness, and the PDF structure suggests a link-farming SEO tactic to distribute malicious content. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9681

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/roblox-azure-mines-hack-game-hack PDF link annotation
    • http://jdlwealth.com/images/coin-master-free-spin-link-app_GM406889139.pdfIn PDF document text
    • http://jdlwealth.com/images/how-to-get-free-minecraft-skins_GM479516143.pdfIn PDF document text
    • http://jdlwealth.com/images/free-robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • http://jdlwealth.com/images/roblox-hack-game_GM431946152.pdfIn PDF document text
    • http://jdlwealth.com/images/best-site-for-free-coin-master_GM406889139.pdfIn PDF document text
    • http://jdlwealth.com/images/free-coins-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://jdlwealth.com/images/coin-master-free-coins-and-spins-link_GM406889139.pdfIn PDF document text
    • http://jdlwealth.com/images/roblox-cheater_GM431946152.pdfIn PDF document text
    • http://jdlwealth.com/images/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • http://jdlwealth.com/images/how-to-get-free-robux-without-verifying-2021_GM431946152.pdfIn PDF document text
    • http://jdlwealth.com/images/master-coin-master-free-spin_GM406889139.pdfIn PDF document text
    • http://jdlwealth.com/images/is-minecraft-free_GM479516143.pdfIn PDF document text
    • http://jdlwealth.com/images/free-robux-that-actually-works-2021_GM431946152.pdfIn PDF document text
    • http://jdlwealth.com/images/coin-master-hack-mod-apk-2021_GM406889139.pdfIn PDF document text
    • http://jdlwealth.com/images/how-do-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://jdlwealth.com/images/how-can-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://jdlwealth.com/images/haktuts-2021-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://jdlwealth.com/images/where-to-get-free-tiktok-followers_GM835599320.pdfIn PDF document text
    • http://jdlwealth.com/images/free-spin-sites-for-coin-master_GM406889139.pdfIn PDF document text
    • http://jdlwealth.com/images/tiktok-like-bot-free_GM835599320.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004f31.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F31 25228 bytes
SHA-256: dc647a5800fad04a6474ae169fe4eaa6495592e8c8f3b40575e63702a6eb03da
font_01_sfnt_off00008897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8897 2940 bytes
SHA-256: eb230542719c96b42e3fd8bb01e35f13ebd5f02629049da3a58e7fd7607bf48a
font_02_sfnt_off000092a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92A2 6100 bytes
SHA-256: f866077ce59d6ea276f75e4af76daa2aab5f3a1a679df144776123d85664d65c
font_03_sfnt_off0000a12e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA12E 18720 bytes
SHA-256: 50c7e578a8cc989c449c4ee65c3443a439142566f522f15237a8991b078115f6

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