Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d121fbe1bfe7a6a…

MALICIOUS

PDF

34.8 KB Created: 2021-07-01 08:05:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: b1ad7029452d6629b6eda968088048ae SHA-1: 8a13dc76852037712e314c989365c4a874ac0769 SHA-256: 3d121fbe1bfe7a6a872f75f1086df0425193061011a137142bd17b517ce9053a
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one that redirects to malicious infrastructure, masquerading as a 'free generator' or 'game hack'. The document body and heuristics indicate a lure for game-related cheats, likely to download further malware or engage in phishing. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

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.co/app/431946152/free-robux-without-downloading-an-app-game-hack In PDF document text
    • https://pustaka.widyakartika.ac.id/repository/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/free-robux-havck_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/minecraft-java-edition-redeem-code-free-2021_GM479516143.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/free-robux-no-survey-mac_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/easy-robux-hack-on-ipad_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/how-to-get-hack-in-rake-roblox_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/how-to-get-a-free-thumbnail-on-roblox_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/free-hair-roblox-hack_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/free-roblox-exploits-2021_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/free-shirt-templates-roblox_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/robuxlove-net-free-robux_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/roblox-how-to-get-free-clothes-2021_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/free-ways-to-get-robux_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/cheat-codes-little-mix-roblox-id_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/multiplayer-master-hack-coins_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/free-redeem-codes-for-roblox-2021_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/get-coin-master-free-spin_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/coin-master-generator-free_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/how-do-you-get-robux-free-glitch-2021_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/como-hackear-roblox-en-pc-para-tener-ventajas_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_off00003028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3028 21772 bytes
SHA-256: 1612e3ac69958338602166517bbf5e9ecaaad35013c50796a17cc41c3a92e1a9
font_01_sfnt_off00005fff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FFF 20060 bytes
SHA-256: 4fe62c0a3de3713fcc2efd65f4caff5ee2298638654ea382fbacbd5928430aaf

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