Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c3c2a99f5e3394c…

MALICIOUS

PDF

34.5 KB Created: 2021-06-29 18:13:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: eef7845a0ea8d6ef060b8998f79023de SHA-1: 1c282f4d3aa39f2d196b97dc444894c2d940cbec SHA-256: 6c3c2a99f5e3394cd712a0c585308cb20095737c285b3f18bb12aa267a754a92
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links designed to lure users into downloading game hacks and cheats, such as for Roblox and Coin Master. One critical heuristic identified a link to a known malicious redirector infrastructure, and another indicated a large number of external PDF links, suggesting a link farm for SEO manipulation. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a malicious intent to redirect users to potentially harmful content or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/can-u-get-free-robux-game-hack In PDF document text
    • http://library.stikessuakainsan.ac.id/repository/roblox-exploit-download-for-free_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/free-roblox-download-on-xbox-one_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id//repository/free-robux-with-no-survey_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/filtered-v12-roblox-cheat-download_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/daily-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id//repository/coin-master-hack-mod-apk-unlimited-spins_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id//repository/free-coin-and-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/hack-roblox-electric-state_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/coin-master-hack-apk-2021_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/minecraft-that-you-can-play-for-free_GM479516143.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/roblox-hack-app_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/roblox-proto-hack_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id//repository/minecraft-wurst_GM479516143.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/free-coins-app-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id//repository/coin-master-hack-tool-india_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/robuxglobalcom_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/extra-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/coin-master-deals_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/project-lazarus-roblox-cheat_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/game-give-free-robux_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_off00002fcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FCB 22612 bytes
SHA-256: 3f1bab21b041696941ce59218bf7f7aab97c18f40ca615ea42eb2fe7df8f6832
font_01_sfnt_off0000624f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x624F 18820 bytes
SHA-256: 52be6a65770a01cbb173e94763e18c68b2166cf4419204c0ca48f3c63de48c00

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