Malicious PDF — malware analysis report

Static analysis result for SHA-256 51b873b645c891b6…

MALICIOUS

PDF

34.1 KB Created: 2021-07-03 12:04:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 1c15aef01eaa719d703c107f5d0cdeb0 SHA-1: 8e2b95a35bc16cc547727b0eefc30e6c136e4883 SHA-256: 51b873b645c891b6c7482221f932a8eca41c82a9d4e170e7ef7310d3bf45e529
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that lead to known malicious redirector infrastructure, specifically advertising free game hacks and generators. The primary malicious URL identified is http://netcdn.tw/app/479516143/minecraft-free-android-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a social engineering tactic to drive users to potentially malicious websites. The ML classifier also flagged this PDF 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.tw/app/479516143/minecraft-free-android-game-hack In PDF document text
    • https://www.tdbaska.hr/files/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • https://www.tdbaska.hr/files/free-robux-app_GM431946152.pdfIn PDF document text
    • http://www.tdbaska.hr/files/roblox-how-to-cheat-on-tycoon-games-2021_GM431946152.pdfIn PDF document text
    • http://www.tdbaska.hr/files/free-roblox_GM431946152.pdfIn PDF document text
    • http://www.tdbaska.hr/files/legit-coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://www.tdbaska.hr/files/free-robux-com-roblox_GM431946152.pdfIn PDF document text
    • http://www.tdbaska.hr/files/link-coin-master_GM406889139.pdfIn PDF document text
    • http://www.tdbaska.hr/files/claimrbx-free-robux_GM431946152.pdfIn PDF document text
    • https://www.tdbaska.hr/files/coin-master-haktuts_GM406889139.pdfIn PDF document text
    • http://www.tdbaska.hr/files/hack-de-robar-cuentas-de-roblox_GM431946152.pdfIn PDF document text
    • https://www.tdbaska.hr/files/roblox-com-r_GM431946152.pdfIn PDF document text
    • http://www.tdbaska.hr/files/get-free-followers-on-tiktok_GM835599320.pdfIn PDF document text
    • https://www.tdbaska.hr/files/free-robux-card-codes_GM431946152.pdfIn PDF document text
    • http://www.tdbaska.hr/files/coin-master-hackcom-xyz_GM406889139.pdfIn PDF document text
    • https://www.tdbaska.hr/files/pokemon-go-free-98-iv_GM1094591345.pdfIn PDF document text
    • https://www.tdbaska.hr/files/free-vilicus-roblox-tablet_GM431946152.pdfIn PDF document text
    • https://www.tdbaska.hr/files/coin-master-hack-apk-android_GM406889139.pdfIn PDF document text
    • https://www.tdbaska.hr/files/how-to-get-free-robux-pins_GM431946152.pdfIn PDF document text
    • https://www.tdbaska.hr/files/coin-master-game-free-play-online_GM406889139.pdfIn PDF document text
    • http://www.tdbaska.hr/files/coin-drop-master-free_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_off0000304a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x304A 22640 bytes
SHA-256: 22ae4507714a1c5a36f8ab8a3a59a3f12f71c90d7b7baeedadb77765366077ea
font_01_sfnt_off000062ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62EE 18172 bytes
SHA-256: 76a46b6ffa672d4629705b025ed1d2900a12de91bcde6df1b9c7209dc48d6afd

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