Malicious PDF — malware analysis report

Static analysis result for SHA-256 c13d1c0bf1eb3deb…

MALICIOUS

PDF

35.1 KB Created: 2021-06-28 15:24:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 2fa4465d879b1e43a8f5948bba9a37b8 SHA-1: 0e31ef932062479afcbc6abee56cb6a8ae3b608b SHA-256: c13d1c0bf1eb3deb2cb67a7131821b48169e371cab3406fb60673715111e662d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to known malicious redirector infrastructure, specifically advertising free game hacks and generators for popular games like Roblox. The document body and embedded URLs strongly suggest a lure to trick users into visiting potentially harmful websites. The ML classifier also flagged this PDF as malicious with high confidence.

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/roblox-car-crushers-2-free-game-hack In PDF document text
    • https://foc.vn/public/upload/files/daily-free-spin-coin-master-link_GM406889139.pdfIn PDF document text
    • https://foc.vn/public/upload/files/roblox-dentist-game-online-free_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/microsoft-roblox_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/how-do-we-get-free-robux_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/youtube-free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/funny-roblox-hacker-names_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/free-minecraft-account-and-password_GM479516143.pdfIn PDF document text
    • https://foc.vn/public/upload/files/free-non-hack-robux-generators_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/rbx-free-robux_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/how-do-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://foc.vn/public/upload/files/how-to-get-minecraft-realms-for-free_GM479516143.pdfIn PDF document text
    • https://foc.vn/public/upload/files/free-robux-no-human-c-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/free-robux-no-verification-needed_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/coin-master-free-chip_GM406889139.pdfIn PDF document text
    • https://foc.vn/public/upload/files/free-roblox-followers_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/coin-master-latest-mod-apk-free-download_GM406889139.pdfIn PDF document text
    • https://foc.vn/public/upload/files/roblox-muscle-simulator-hack_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/hacking-websites-for-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
stream_002_off0000308d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x308D 23028 bytes
SHA-256: 40340a69fe9cd049b5c727a083924497c686e18edfc034f23b5905a39e369c01
font_01_sfnt_off0000645a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x645A 19080 bytes
SHA-256: e0d9f1e9778128730295cce02f816c42bede358d02d9cf2240a8577c6df98740