Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d6fdfab5bf9d493…

MALICIOUS

PDF

35.1 KB Created: 2021-07-04 20:53:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: fedc330444708198bc6921e4e46465ef SHA-1: 138dc1e053ad91d471a81e0956734adf3ef6e19f SHA-256: 3d6fdfab5bf9d493bb5bed035f1d55cdae8c85723a1cc774d5c61136894d0889
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple links to websites offering 'free Robux' or 'game hacks', which are common lures for phishing and malware distribution. One of the embedded URLs, http://netcdn.tw/app/431946152/free-robux-generator-without-human-verification-game-hack, is identified as a malicious redirector. The document's structure and content strongly suggest it is part of a phishing campaign, likely aiming to trick users into downloading further malicious payloads or revealing sensitive information.

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/431946152/free-robux-generator-without-human-verification-game-hack In PDF document text
    • http://103.40.122.33/akasia/repository/free-robux-that-actually-works_GM431946152.pdfPDF link annotation
    • http://103.40.122.33/akasia/repository/robux-free-hack-xyz_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/free-robux-login_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/free-robux-android_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/roblox-anthem-hack-edition_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/foxyhackscom-free-robux_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/wwwrobloxcom-cheat-codes_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/pokemon-go-free-lures_GM1094591345.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/rorewards-com-earn-free-robux-for-roblox_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/free-code-for-huge-cat-pet-in-roblox-2021_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/how-to-hack-money-in-gas-station-simulator-roblox_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/roblox-jailbreak-hack-mega_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/roblox-shades-free_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/free-robux-survey_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/claim-free-spins-coin-master_GM406889139.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/best-roblox-hacks-2021-hand_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/coin-master-mod-apk-latest-hack-with-unlimited-free-spins_GM406889139.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/free-robux-app_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_off00003153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3153 22116 bytes
SHA-256: efd8bc323cd9daafbec85a4b3f580860ae908e3b99cf8994fee85f0800c7fa76
font_01_sfnt_off00006266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6266 19700 bytes
SHA-256: e60e9168f8cab27eb8b59583525fe8b5ec14cc0a6d13d4687843cfc281cbaf60

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