Malicious PDF — malware analysis report

Static analysis result for SHA-256 42f6f95774ec6db7…

MALICIOUS

PDF

34.9 KB Created: 2021-07-01 13:09:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 074708cd6aad2f7fd59af44354664a89 SHA-1: ad55f6957e6d06ea8b09c15cd007cc4a28f057a0 SHA-256: 42f6f95774ec6db7bc912e470437a5607a2a23cfc28aa990985997b91b826cde
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links designed to lure users into clicking on what appears to be a game hack or free currency generator. These links redirect to known malicious infrastructure, indicating a phishing or scam attempt. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.co/app/431946152/roblox-free-robux-code-2021-game-hack In PDF document text
    • http://repository.ummy.ac.id//repository/guide--coin-master-free-tips_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/moonactive-free-spins_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/how-to-get-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/free-coin-and-spin-for-coin-master_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/coin-master-cheats-free_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/roblox-exploit-scripts_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/how-to-get-free-robux-on-alcatel_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/earn-robux-gg-earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-minecraft-java-account_GM479516143.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/actual-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/roblox-full-spiderman-outfit-free_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-coin-and-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/fight-club-hack-roblox_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/shadowrun-skip-cheat-codes-roblox_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/coin-master-daily-free-spins-link_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/reddit-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/how-to-get-free-robux-gift-cards_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/hack-para-roblox-de-robux-2021_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-robux-for-kids-no-verification_GM431946152.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_off00002f9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F9B 22596 bytes
SHA-256: 7f9b0a374a1e2075534a7183bf010a51fe28c4df5db00df97a2da8e2f778a3cf
font_01_sfnt_off0000622c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x622C 19364 bytes
SHA-256: 178b9c5582d7b5edd396fad32783d551a7a2ee6785292aa17466bfcd6084bd5a