Malicious PDF — malware analysis report

Static analysis result for SHA-256 680a1445cc94909c…

MALICIOUS

PDF

33.9 KB Created: 2021-07-05 12:17:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 99fec78ab3ce144b4da2c47bf13a28d7 SHA-1: 8a84327f909fa7019dafd37618c45f723b4aed53 SHA-256: 680a1445cc94909cc4aa4d50d55c92d3defca3154c4d4b14ddd2aa13e0424545
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to known malicious infrastructure, specifically advertising free game currency or hacks. The ML classifier strongly flagged this PDF as malicious. The primary lure URL is http://netcdn.tw/app/431946152/robux-free-2021-game-hack, which appears to be the entry point for a phishing or malware distribution chain.

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/431946152/robux-free-2021-game-hack In PDF document text
    • http://libnh.stikesnh.ac.id/repository/coin-master-free-spins-coins_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-robux-script_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/coin-master-hack-android-no-root_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/pokemon-go-free-account-2021_GM1094591345.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/haktuts-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/coin-master-free_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/how-to-get-free-robux-on-android-without-human-verification_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-robux-generator-no-survey-no-download-no-human-verification_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/how-to-get-free-robux-on-iphone_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/easy-points-gg_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/how-to-hack-roblox_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/coin-master-free-shield-link_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/freer-pro-tiktok_GM835599320.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/what-games-on-roblox-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/coin-master-hack-spins-and-coins-unlimited-free_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/open-coin-master_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/coin-master-hack-ios-download-2021_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/youtube-hack-aimbot-roblox_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_off00002dcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DCC 22228 bytes
SHA-256: 030e7d804f2905302f1cd839b77ad4d701b2b7a5c99ee0bdbc8796662e464f0d
font_01_sfnt_off00005f22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F22 19116 bytes
SHA-256: 4c1a9a86b4b6699ac70fc87850995a4a744955ac9e840568fd45137616a01a77

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