Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b1722fc5167028d…

MALICIOUS

PDF

33.8 KB Created: 2021-06-19 17:28:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 08fbf8ac9b631e4e93c032818ff7a899 SHA-1: 55865086e1fc776236427bc723a16d33267fe938 SHA-256: 3b1722fc5167028dc290a6a04da01eda78e3dd9f0879b37297f2ff0eb7d3e2e5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure of free game currency and hacks to trick users into clicking embedded links. These links redirect to known malicious infrastructure, indicating a phishing or scam attempt. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, but the document's structure and embedded URLs are sufficient to determine its malicious intent.

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/free-robux-nunchuks-game-hack In PDF document text
    • http://repository.ummy.ac.id//repository/free-roblox-accounts-with-robux-that-work-not-banned-2021_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/monster-battle-hack-roblox_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/how-to-get-free-robux-for-kids_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/minecraft-hacks-115-2_GM479516143.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/free-roblox-hacks-no-injector_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/freerobuxhack-us_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/roblox-cheat-codes-no-phone_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-online-minecraft-server_GM479516143.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/coin-master-new-link-free-spin_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/bloxland-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/roblox-hacks-lua-commands_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/how-to-get-minecraft-dungeons-for-free_GM479516143.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-roblox-hair-to-wear_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/roblox-free-robux-hack-instant-proof-2021_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/case-clicker-hack-pc-roblox_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-spins-coin-master-android_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/roblox-hack-tool_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-minecraft-hosting-24-7_GM479516143.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_off00002e50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E50 22008 bytes
SHA-256: c52a91d84413377dc8fd7926f361a884a5a98b9cb2e77191ed945e61fbde414b
font_01_sfnt_off00005ef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EF5 19052 bytes
SHA-256: 060b7b2a84220b5ab57b6a717681778bd9a789e3139abb953721f22a75d6553b

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