Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ef3f9540a4d1c2f…

MALICIOUS

PDF

42.3 KB Created: 2021-05-11 21:00:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d4cfa57c2f874d0b3b1b09c359c76eee SHA-1: bc3702fcf46dc7913026793100c368a230140f73 SHA-256: 5ef3f9540a4d1c2f7b0d302984cc17de0061ac72cfbca2b29bdf3bf66bf25e4a
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links designed to lure users into clicking on what appear to be game hacks or generators, but which redirect to malicious infrastructure. The primary redirector URL is https://netcdn.xyz/app/406889139/haktuts-coin-master-free-daily-spins-game-hack, which then leads to a large number of other PDFs hosted on reggieslockandkey.com. This indicates a link farm designed to distribute potentially malicious content or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.
  • 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.
  • 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 https://netcdn.xyz/app/406889139/haktuts-coin-master-free-daily-spins-game-hack In PDF document text
    • http://reggieslockandkey.com/images/how-can-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://reggieslockandkey.com/images/tiradas-coin-master_GM406889139.pdfIn PDF document text
    • http://reggieslockandkey.com/images/coin-master-free-spins-fb_GM406889139.pdfIn PDF document text
    • https://reggieslockandkey.com/images/minecraft-bedrock-free-server-hosting_GM479516143.pdfIn PDF document text
    • http://reggieslockandkey.com/images/daily-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://reggieslockandkey.com/images/john-doe-roblox-hacker_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/coin-master-free-coins-and-spins-link_GM406889139.pdfIn PDF document text
    • http://reggieslockandkey.com/images/free-texture-packs-for-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://reggieslockandkey.com/images/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://reggieslockandkey.com/images/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/free-robux-just-enter-username-and-password_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/minecraft-beta-free_GM479516143.pdfIn PDF document text
    • http://reggieslockandkey.com/images/block-best-robux_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/minecraft-free-download-mobile_GM479516143.pdfIn PDF document text
    • http://reggieslockandkey.com/images/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/lazyblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/game-give-free-robux_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdfIn PDF document text
    • http://reggieslockandkey.com/images/free-spins-and-coins-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • https://reggieslockandkey.com/images/free-robux-promo-codes_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
stream_003_off00004825.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4825 25352 bytes
SHA-256: 5e02eff510a041bde6ae1d5c4cb24d22a8922e4a2d152f3b21d6383e4cd76522
font_01_sfnt_off0000822d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x822D 18620 bytes
SHA-256: ded7de44f7a870837d4ef416985ae0b9ef78dce3540f45b1558d033e63b05ca7

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