Malicious PDF — malware analysis report

Static analysis result for SHA-256 042b928435f08a95…

MALICIOUS

PDF

34.7 KB Created: 2021-07-05 15:10:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: ecea2424cb598891bbc1adb0d3992c82 SHA-1: c6931cfdaa9b68bc503c2ac2c02a7cb2f6e05c53 SHA-256: 042b928435f08a955f946a83176cd1c0d4a25bc9a58262afac895eaf6cdda410
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains multiple embedded links that redirect to a malicious domain, masquerading as a game hack generator. The primary lure is a 'Coin Master Hack Pc 2021' which directs users to http://netcdn.tw/app/406889139/coin-master-hack-pc-2021-game-hack. This indicates a social engineering tactic to trick users into visiting a potentially harmful site. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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/406889139/coin-master-hack-pc-2021-game-hack In PDF document text
    • http://library.ulb.ac.id/repository/minecraft-free-no-virus_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-pro-roblox-stuff_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/roblox-how-to-get-free-robux-in-2021_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/hack-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/free-robux-net_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-hack-dragon-ball-after-future-roblox_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-minecraft-skins-girl_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/all-coin-master-spin-link-and-free-download_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/roblox-hack-copy-and-paste_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/2021-free-robux-today-hack-created-by-robuxian_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/free-robux-survey_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/free-robux-hacker-us_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/elemental-battlegrounds-roblox-shard-hack_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-get-free-robux-javascript-2021_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-robux-todat_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/roblox-admin-hack_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-games-to-get-robux_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/ma-map-roblox-studio-hacker-par_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-hack-roblox-accounts-2021_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_off00003030.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3030 22976 bytes
SHA-256: 3639c21639a6ee923441bb6b80004153122f5a1de8b8ab4dae2841e799230d46
font_01_sfnt_off000063d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63D7 18560 bytes
SHA-256: eeb023a91ba39b5fa554a6c784e72bf16b3eaf0df26123cf10d120866bb40872

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