Malicious PDF — malware analysis report

Static analysis result for SHA-256 99d6f81a6aa6b81b…

MALICIOUS

PDF

34.6 KB Created: 2021-06-20 00:06:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 2d817fd7ff80251a99da4135d81ef660 SHA-1: 22550637bb1f1a625e3d6e53f5f52873ee6167e2 SHA-256: 99d6f81a6aa6b81b387223b0595ee19e6d4a101985756d5c71e3ca5e6ab89423
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to malicious redirectors and IP addresses, disguised as generators for game currency like Robux. The document body and heuristics indicate a lure for free game hacks, which is a common social engineering tactic. The ML classifier strongly flagged this PDF as malicious, supporting the observed malicious links.

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.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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-roblox-account-generator-obc-game-hack In PDF document text
    • http://103.40.122.33/akasia/repository/roblox-cheats-pris_GM431946152.pdfPDF link annotation
    • http://103.40.122.33/akasia/repository/roblox-mobile-cheat-codes_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/hey-google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/blox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/how-to-hack-a-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/robux-and-tix-hack-no-download_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/free-robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/how-to-hack-people-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/free-coin-master-links_GM406889139.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/roblox-hack-pretty-face-hack_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/speed-simulator-2-roblox-hack_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/fre-robux-hacks_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/how-do-you-lv-up-in-hacking-simulator-roblox_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/cydia-roblox-hack_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/roblox-longest-super-fun-obby-cheats_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/hack-with-script-roblox_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/how-to-hack-roblox-for-robux_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_off00003155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3155 22216 bytes
SHA-256: a21d3b8ef170306cc0a9134948e9de1ebb4ddc6a7d1d4169db9ea7977effb167
font_01_sfnt_off000062a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62A8 18896 bytes
SHA-256: df41bbc29a973ebb48dee788dd477ec9dcc4b6e4b797e1ec79fff18f332ff4e6

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