Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ef4d6f2d8cd22e9…

MALICIOUS

PDF

34.9 KB Created: 2021-06-26 03:58:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 30bbe6b48e1466830513f11e294ec166 SHA-1: 0c79240223a4ad75505c08b0bb4bf7f9ed26507a SHA-256: 8ef4d6f2d8cd22e91955869a42e1e415a9558150c4047f831f9a8fc7f16abe11
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure of game hacks and free in-game currency to trick users into clicking malicious links. It contains multiple embedded URLs pointing to a redirector and further PDF files hosted on an IP address, likely serving as a downloader for additional malicious content. The ML classifier strongly indicated maliciousness, and the presence of redirector links and IP-based URLs supports a high confidence assessment.

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/paper-mario-roleplay-roblox-cheat-engine-game-hack In PDF document text
    • http://103.40.122.33/akasia/repository/free-robux-easy-just-username-and-then-get-robux_GM431946152.pdfPDF link annotation
    • http://103.40.122.33/akasia/repository/get-robux-for-free-for-robloxcom-free4mobile24com_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/free-robux-builders-club_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/does-roblox-premium-expire_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/roblox-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/minecraft-building-hacks_GM479516143.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/roblox-promo-code-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/all-roblox-eggs-2021-hack-pastebin_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/how-to-cheat-in-roblox-ro-ghoul_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/games-on-roblox-that-give-you-free-robux_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/roblox-free-radio-games_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/free-coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/free-robux-code-on-roblox_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/roblox-dll-hack-2021_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/free-clothing-roblox-hack_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/web-roblox-com-free-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_off000030a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30A9 22216 bytes
SHA-256: 2341f3ebefec9276d9f571c4c748c8cea9f1b74eff315f62391f84a8eed29977
font_01_sfnt_off000061d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61D2 19584 bytes
SHA-256: bbfa04cc14d449d5f4978bf2f0c30e57eb9685bf2a2bb7acac3505935ebf7771

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