Malicious PDF — malware analysis report

Static analysis result for SHA-256 c67d877c6413c555…

MALICIOUS

PDF

42.5 KB Created: 2021-05-12 09:40:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: dc04691746a725ef6da92832a2bec9aa SHA-1: 29b93529a2ccd15fccf36d969e28561e577e2f61 SHA-256: c67d877c6413c55561338967d18a865af9c57b346c3eac055ec1270c9b697774
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that lead to malicious redirectors, specifically promoting 'free generator' or 'game hack' lures for popular games like Coin Master and Roblox. The document body and extracted URLs confirm this phishing pretext. While no scripts were directly extracted, the PDF structure and malicious links indicate a likely attempt to redirect users to a compromised site, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/406889139/coin-master-hack-twitter-game-hack In PDF document text
    • http://www.donjastubica.hr/files/coin-master-spin-cheat_GM406889139.pdfIn PDF document text
    • https://www.donjastubica.hr/files/get-free-minecraft-account_GM479516143.pdfIn PDF document text
    • http://www.donjastubica.hr/files/blox-supply-free-robux_GM431946152.pdfIn PDF document text
    • https://www.donjastubica.hr/files/real-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.donjastubica.hr/files/coin-master-no-download-app-but-play-for-free_GM406889139.pdfIn PDF document text
    • http://www.donjastubica.hr/files/roblox-tracker_GM431946152.pdfIn PDF document text
    • http://www.donjastubica.hr/files/roblox-g_GM431946152.pdfIn PDF document text
    • https://www.donjastubica.hr/files/free-robux-no-verification-2021-ios_GM431946152.pdfIn PDF document text
    • https://www.donjastubica.hr/files/freerobuxhack-us_GM431946152.pdfIn PDF document text
    • https://www.donjastubica.hr/files/where-to-get-robux_GM431946152.pdfIn PDF document text
    • http://www.donjastubica.hr/files/roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • https://www.donjastubica.hr/files/roblox-promo-codes-2021-robux_GM431946152.pdfIn PDF document text
    • http://www.donjastubica.hr/files/coin-master-free-spins-hack-without-human-verification_GM406889139.pdfIn PDF document text
    • https://www.donjastubica.hr/files/roblox-free-executor_GM431946152.pdfIn PDF document text
    • http://www.donjastubica.hr/files/free-coin-master-spins-2021-link_GM406889139.pdfIn PDF document text
    • http://www.donjastubica.hr/files/free-coins-for-coin-master-blogger_GM406889139.pdfIn PDF document text
    • https://www.donjastubica.hr/files/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.donjastubica.hr/files/free-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://www.donjastubica.hr/files/how-to-change-your-username-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://www.donjastubica.hr/files/free-bling-bling-card-coin-master_GM406889139.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_off000047eb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47EB 28216 bytes
SHA-256: b1847b0a0bf17bb074cd8f214a9b66fda4fc6581babcecf0875ac3a795545bbd
font_01_sfnt_off00008516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8516 17880 bytes
SHA-256: 91c2be8de5132e4c01efff6048559585f8cc3e87dd90bf946d8d6b14de046cac

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