Malicious PDF — malware analysis report

Static analysis result for SHA-256 41775ffda46336a0…

MALICIOUS

PDF

34.7 KB Created: 2021-07-05 10:16:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: aa9d8f8c2e68c5390dc5294a84d63aeb SHA-1: d679ea313f182dc0dac4db2c7776a01edc4d0745 SHA-256: 41775ffda46336a0f184f9ec270afc01b68bab3073c30bff8e9af0844e22572a
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links designed to lure users into clicking on them by promising free game hacks and currency. The primary link, http://netcdn.tw/app/431946152/free-robux-safe-game-hack, redirects to known malicious infrastructure. The document body and heuristics indicate a phishing attempt disguised as a free generator or game hack, likely intended to lead users to a malicious website or download further malware.

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.tw/app/431946152/free-robux-safe-game-hack In PDF document text
    • http://library.fikes.upnvj.ac.id/repository/coin-master-daily-free-cards_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/minecraft-bedrock-download_GM479516143.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/coin-master-gold-cards-free_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-robux-easy-and-fast_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/how-to-get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/how-to-play-welcome-to-bloxburg-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/pro-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/roblox-hacked-have-no-pin-code_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-robux-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/coin-master-free-daily-spins-link_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/roblox-hack-teleport_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/how-to-use-cheat-engine-to-hack-roblox-2021_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/pubg-uc-hack-app_GM1330123889.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/coin-master-jackpot-hack_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/coin-master-free-link-spin_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/roblox-com-hack_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-robux-with-no-survey_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_off00003210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3210 22300 bytes
SHA-256: da5bc5c365713de1206da70e3cf489c25dfe4b0efbc3f4343e1c7a50cbb3cede
font_01_sfnt_off000063ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63AE 18716 bytes
SHA-256: 10dbf18a398b54dbdf12e35bff00225a1ca49c244028279e5f56b846bcc4a5be

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