Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc1646b1f4fe37d3…

MALICIOUS

PDF

43.7 KB Created: 2021-05-10 15:34:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 57457caa9eb530ec341da4249b368ae0 SHA-1: 51ed5303c8bcf487880a322dbc697850cff1f356 SHA-256: bc1646b1f4fe37d3829cf9f3e988188dc64890920b0faa94297c5957ebb0a6dd
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs that redirect to a known malicious infrastructure, specifically designed to lure users with promises of free game items or hacks. The ML classifier strongly indicated maliciousness, and the presence of redirector links confirms a malicious intent to lead the user to potentially harmful content or further exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 https://netcdn.xyz/app/431946152/free-robux-com-no-verification-game-hack In PDF document text
    • https://reggieslockandkey.com/images/minecraft-for-free-apk_GM479516143.pdfIn PDF document text
    • http://reggieslockandkey.com/images/coin-master-500-free-spins_GM406889139.pdfIn PDF document text
    • http://reggieslockandkey.com/images/free-spins-and-coins-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://reggieslockandkey.com/images/coin-master-free-coins-app_GM406889139.pdfIn PDF document text
    • http://reggieslockandkey.com/images/minecraft-free-download-mobile_GM479516143.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/robux-website_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/coin-master-free-spins-without-verification_GM406889139.pdfIn PDF document text
    • https://reggieslockandkey.com/images/freespinandcoin-blogspot-com_GM406889139.pdfIn PDF document text
    • https://reggieslockandkey.com/images/games-like-minecraft-but-free_GM479516143.pdfIn PDF document text
    • https://reggieslockandkey.com/images/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • http://reggieslockandkey.com/images/block-best-robux_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/oginject-co_GM406889139.pdfIn PDF document text
    • http://reggieslockandkey.com/images/claim-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://reggieslockandkey.com/images/tower-of-hell-roblox-hack_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/coin-master-free-spins-link-download-apk_GM406889139.pdfIn PDF document text
    • https://reggieslockandkey.com/images/earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/coin-master-hacks-that-actually-work_GM406889139.pdfIn PDF document text
    • http://reggieslockandkey.com/images/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/robux-free-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_off00004b92.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B92 25428 bytes
SHA-256: 4d6d9f6cc152ee5f3112efdf7db9c5bae30f3eaf67c4d91eaceb48fcfac1640f
font_01_sfnt_off000086f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86F0 18860 bytes
SHA-256: fd9d837b898dacd9f5ea22edfb03c528ade61200bf0a18b53858ad02fb024854

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