Malicious PDF — malware analysis report

Static analysis result for SHA-256 b43f5c7d613f8d51…

MALICIOUS

PDF

33.7 KB Created: 2021-07-04 11:57:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 75bcc6de08754a5ec916b25525804021 SHA-1: 4a0bab56ebe6f825e040203316f316ce9dfa877e SHA-256: b43f5c7d613f8d51d43a0d489dcd67759c57c482b819e6492f5531570815efb6
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document employs a lure of game hacks and free in-game currency to trick users into clicking malicious links. The primary link directs to a known malicious redirector infrastructure, which likely serves as a gateway to further malicious content or exploits. The ML classifier strongly supports the malicious nature of this PDF, and the presence of embedded URLs indicates an attempt to lead the user to external malicious sites.

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.tw/app/431946152/heroes-online-roblox-game-hack In PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/roblox-free-not-blocked_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/free-roblox-army-template_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/coin-master-tiradas-gratis-2021_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/black-adidas-hoodie-roblox-free_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/hack-skin-roblox-free_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/free-minecraft-alt-generator_GM479516143.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/free-robux-that-actually-works_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/how-to-lvl-hack-in-naruto-final-bond-in-roblox_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/free-robux-youtube_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/free-minecraft-codes-2021_GM479516143.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/tiktok-free-download-for-windows-10_GM835599320.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/robux-prices_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/coin-master-coins-free_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/tiktok-free-icon_GM835599320.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/how-to-get-free-spins-in-shinobi-life-roblox-125_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/pubg-uc-hack-2021_GM1330123889.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/minecraft-kill-aura_GM479516143.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/coin-master-haktuts_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/coin-master-hack-apk-download-for-android-mobile_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
font_00_sfnt_off00002f36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F36 22200 bytes
SHA-256: b963b3712987b57269e11c4c7b61d9b3fa088d867da058f6bbed0d2ea137365f
font_01_sfnt_off00005fe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FE6 18608 bytes
SHA-256: 33248c1138d663f4f7d8a086266eca948d2c0a240b56e70760f45c3c841191a4

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