Malicious PDF — malware analysis report

Static analysis result for SHA-256 879a8331ed24a505…

MALICIOUS

PDF

34.3 KB Created: 2021-07-06 09:34:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 7d9ca519be612345945fabb34fcb9508 SHA-1: 92c3697228016ee9f69ae135b131e6d1e824a02b SHA-256: 879a8331ed24a505c5a24c1db5d001e6aaf75a7089306d48275e8a4350718d69
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to external websites, including a known malicious redirector at http://netcdn.tw/app/479516143/how-to-get-creative-mode-in-minecraft-server-hack-game-hack. The document body and heuristic firings indicate a lure related to game hacks and free currency, designed to entice users to click these links. The ML classifier strongly supports the malicious nature of this PDF.

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/how-to-get-creative-mode-in-minecraft-server-hack-game-hack In PDF document text
    • http://gts.edu.gh/library/repository/free-robux-no-verify-2021_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/free-roblox-phantom-forces-hacks_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/roblox-free-robux-pins_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/aos-hack-roblox_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/coin-master-hack-online-android_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/spin-coin-master-free_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/coin-master-hack-ios-jailbreak_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/robux-giver_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/roblox-troll-outfits-free_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/free-robux-codes-2021-real_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/roblox-sing-hack_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/coin-master-20-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/minecraft-hacked-client-112-2_GM479516143.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/free-robux-download_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/hes-hacking-roblox-phantom-forces_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/coin-master-unlimited-spins-apk-free-download_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/today-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/ery-promo-codes-for-robox-free-robuxs_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/free-coin-master-game_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_off000031e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31E4 22164 bytes
SHA-256: 713a5198479f24cf966969443733e73426bd67e2dd648b54708cc3866782c7a4
font_01_sfnt_off0000627a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x627A 18620 bytes
SHA-256: e9ae3ffdb85453ea0374ab223d3fde66ce2aaabe57ac171a5b8ae266564cfd25