Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca35531df26b590c…

MALICIOUS

PDF

35.3 KB Created: 2021-07-08 05:23:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 3c975b0950f7677452f625dcbfd59682 SHA-1: 177d8997db9a1a3a0757ec93a3ed86e5c8f22720 SHA-256: ca35531df26b590cea5f5b9bcb1ae1de7801147e57875e5299b7bc7a113e4f3e
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to websites offering free game currency or hacks, such as 'tiktok-free-ad-credit-game-hack' and various 'robux' related lures. These links, including one pointing to a raw IP address, are indicative of a phishing or scam attempt designed to redirect users to potentially malicious sites. The presence of a malicious redirector infrastructure further supports this 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.tw/app/835599320/tiktok-free-ad-credit-game-hack In PDF document text
    • http://103.40.122.33/akasia/repository/coin-master-free-spins-2021_GM406889139.pdfPDF link annotation
    • http://103.40.122.33/akasia/repository/ahjefhz-roblox-hack_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/free-robux-website-the-best-my-website_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/fre-robux-now_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/how-to-get-a-vip-server-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/free-tiktok-likes-trial_GM835599320.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/unlimited-robux-hack-for-computer_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/how-to-get-free-robux-inspect-element-2021_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/free-robux-no-scams-2021_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/free-coin-master-cards_GM406889139.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/how-to-get-free-robux-on-ipad-mini-2_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/hacker-png-roblox_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/how-to-hack-roblox-accounts-2021-v3rmillion_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/rainbow-antlerts-free-roblox_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/gladiator-now-we-are-free-roblox-song-id_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/roblox-change-face-hack_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/roblox-avatar-free-superhero-body_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/visea-descargar-hack-roblox_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/how-to-hack-roblox-prison-life-on-chromebook_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_off00003417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3417 22972 bytes
SHA-256: e26382c7d69ca44b8de78c8eee3a763c0d4c945aadf4dc3c3b85807cb44f5fd0
font_01_sfnt_off000067da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67DA 18148 bytes
SHA-256: 966cdc1c450275172ced565743ab7be3d5d41ccaec9ea9a1d336ff99e56a78c4

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