Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8971bb23e1b210d…

MALICIOUS

PDF

37.3 KB Created: 2021-07-06 12:59:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 96761d67256e2adca75bdd1139b976ac SHA-1: 57b7ddc4152120170ac8b8b5d8896ecca73b4f72 SHA-256: d8971bb23e1b210dfa6c141fd136722b7d5ea7aa04766ece8876141a4e7fbace
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one identified as a malicious redirector, that promise free game currency or hacks. The primary lure is to direct users to potentially harmful websites. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the lures suggest an attempt to lead users to a malicious site, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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/406889139/links-to-get-free-spins-on-coin-master-game-hack In PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-get-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/roblox-play-free-no-sign-in_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-hack-someones-acc-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/roblox-4-free-codes_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/hack-de-robux-en-roblox-espaol-en-3-minutos_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/the-only-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/robux-for-surveys_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-robux-android_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/adfly-hack-robux_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-get-free-robux-december-2021_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/minecraft-free-app_GM479516143.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/vido-roblox-ninja-legends-hack_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/cranberry-roblox-hack-download_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-robux-pin-codes_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/video-hacker-roblox_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-use-roblox-script-hack_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-roblox-dominus-november-2021_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/wurst-112-2_GM479516143.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/cheat-in-roblox-free-robux-pc_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3131 22884 bytes
SHA-256: 8e5af9b9e1c33fd6923bc3ee2dd7b6e3676ab3ac8f415ec792671feeb8a0b025
font_01_sfnt_off0000649f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x649F 2896 bytes
SHA-256: c1a618813a64314343402b2ec738fc11c4c912460a4c7ae3029924d2f9a229cd
font_02_sfnt_off00006e84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E84 18344 bytes
SHA-256: 1dde3a634a35d4e9c8cc8702715575f7350bc413b734fd9f7bac35511dc11ac3

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