Malicious PDF — malware analysis report

Static analysis result for SHA-256 385e2c719a76eb7b…

MALICIOUS

PDF

31.7 KB Created: 2021-07-05 23:15:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: fca5b3b336d8f5904f0cd8f53ef87459 SHA-1: b1469a9efba9fa54c660704e0f4df4c8d799bd0d SHA-256: 385e2c719a76eb7bf03847210cccfe3c25a51d5de23bcf1c5088e3b1a2e431fe
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link that is identified as a malicious redirector, specifically designed to lure users with promises of game hacks and free spins for Coin Master. The primary URL, http://netcdn.tw/app/406889139/coin-master-cheat-to-get-free-spins-game-hack, is associated with this lure. The ML classifier also strongly indicated maliciousness. The document body and embedded artifacts do not contain executable scripts, suggesting the primary malicious action is redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 3

  • 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.
  • 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-cheat-to-get-free-spins-game-hack In PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/minecraft-svg-free_GM479516143.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/toolbox-mod_GM479516143.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/free-pe_GM479516143.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/app-store-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/roblox-hack-ga_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/free-roblox-toy-codes_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/how-to-cheat-in-weight-lifting-in-roblox_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/coin-master-hack-quora_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/coin-master-free-spins-uk_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/coin-master-hack-spins-and-coins-unlimited-free-download_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/swordpack-in-roblox-free_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/free-roblox-boy-hair_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/coins-master-hacks_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/free-robux-ios-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/hey-google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/getrobux-now_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/free-robux-2021-code_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/hacking-script-download-roblox_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00002f73.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2F73 23028 bytes
SHA-256: 972808f4e7aae1f49aa6dd9deb7fe9f32a5651ad031484bcdcb9ee7f2d64d78d

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