Malicious PDF — malware analysis report

Static analysis result for SHA-256 98dce2e0429109ff…

MALICIOUS

PDF

32.8 KB Created: 2021-07-04 12:32:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 4ed95c185efc0646ec55ae9a398933da SHA-1: 0eaa7e61fd8411c3a27c35f9253febd96be3d053 SHA-256: 98dce2e0429109ff357310003b08618eb5817be95c3d72ee06f1b09ab34e0788
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and a large number of SEO-optimized links, suggesting a phishing or scam campaign. The document body and extracted URLs indicate a lure related to game hacks and in-game currency, likely intended to trick users into visiting malicious sites. No scripts were extracted, but the presence of numerous links points to a redirection-based attack.

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.tw/app/479516143/minecraft-free-reddit-game-hack In PDF document text
    • http://pustaka.ust.ac.id/repository/free-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/robux-hack-no-survey-no-download-no-password_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/redboy-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-roblox-gift-card-codes-2021-unused_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-make-a-roblox-badge-for-free_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/como-ser-hacker-en-roblox-mad-city_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-fly-hack-in-roblox-lumber-tycoon_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-robux-free-no-survey_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-spins-coin-master-unlimited_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/hown-to-get-ninja-package-for-free-2021-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/rewards-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-robux-you-dont-have-to-do-anything_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/blue-pants-roblox-free_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/links-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/robux-giver_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-roblox-toy-codes-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/roblox-offers-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/roblox-royale-high-diamond-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-get-free-robux-no-verification-on-combuter_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_off00002f22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F22 21564 bytes
SHA-256: fa01906737cad9169f9d69cbf807b8711ae2717af76d8b10dee6f6713c607659
font_01_sfnt_off00005e22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E22 18028 bytes
SHA-256: 643495630a0e2882763c76801d421163758b25dda5a584bed505c907634fa296

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