Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe863bbe007a8dda…

MALICIOUS

PDF

44.5 KB Created: 2021-06-10 23:16:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: aea6ea28471124a68a205ac8fb00063f SHA-1: ad11ea36fa9deaab5425024f9dac7c77bd8dbfe6 SHA-256: fe863bbe007a8dda468f846073c01f405541700c0faf718918ee047cca721237
300 Risk Score

Malware Insights

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

This PDF document employs a fake CAPTCHA lure to trick users into clicking malicious links, specifically pointing to a 'free generator / game hack' site. The document also contains a large number of SEO-optimized links to other PDF files, likely part of a link farm. The primary malicious URL identified is https://netcdn.tw/app/431946152/roblox-boy-outfits-free-game-hack, which is flagged as a known malicious redirector. The document's structure and content suggest it's designed to drive traffic to potentially harmful sites, possibly as a prelude to further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 7

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 https://netcdn.tw/app/431946152/roblox-boy-outfits-free-game-hack In PDF document text
    • http://library.fisip.upnvj.ac.id/repository/free-minecraft-account-and-password-2021_GM479516143.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/free-minecraft-java-edition-codes_GM479516143.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/free-robux-gift-card-codes-giveaway-live_GM431946152.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/admin-codes-that-give-you-free-robux-2021-working_GM431946152.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/how-do-we-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/coin-master-free-spins-and-coins-app-download_GM406889139.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/roblox-no-download-hack_GM431946152.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/delitive-mod-cheat-codes-roblox_GM431946152.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/hack-coin-master-net_GM406889139.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/pokemon-go-free-spoofing-ios_GM1094591345.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/roblox-download-pc-free_GM431946152.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/mobihack-net-roblox-hack_GM431946152.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/free-tiktok-likes-2021_GM835599320.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/pig-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/coin-master-free-link_GM406889139.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/get-free-tiktok-likes_GM835599320.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/free-spins-coin-master-2021-no-verification_GM406889139.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/how-to-get-free-pet-food-on-coin-master_GM406889139.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/how-do-you-hack-minecraft_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
stream_004_off00005059.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5059 25812 bytes
SHA-256: 49e4901175f51db5c01fa174bddf5c966d8b3e531aead3ab6e715199c51de790
font_01_sfnt_off00008ac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AC0 18492 bytes
SHA-256: 7855c0b61f91082c60632f2446ab2abf025f860a5e0738bd5d8d50557a895015

Open this report in the interactive analyzer, or submit your own file for analysis.