Malicious PDF — malware analysis report

Static analysis result for SHA-256 4017344ba0fe9f09…

MALICIOUS

PDF

41.6 KB Created: 2021-05-11 22:07:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: a4d4ea4d5afb844ddf564e5807a9feb1 SHA-1: 31052633bae8ced8d582348504e2bba0e83f3f63 SHA-256: 4017344ba0fe9f09b24dcd2a9d41524584c6934162ecee87e029ba87bc498be4
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and websites offering 'game hacks' or 'free spins', indicative of a phishing or scam lure. The document body and embedded URLs suggest the intent is to trick users into visiting these sites, likely to download further malware or engage in fraudulent activities. No scripts were extracted, but the presence of malicious links and the ML classifier's high confidence score support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://netcdn.xyz/app/406889139/working-coin-master-hack-game-hack In PDF document text
    • http://elibrary.perludem.org/repository/coin-master-free-spins-link-2021-march_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/robux-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/sites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/how-to-get-free-robux-without-doing-anything-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/free-robux-place_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/coin-master-code-for-free-spins_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/easy-roblox-today_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/hack-de-coin-master_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/minecraft-reach-hack_GM479516143.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/free-robux-redeem-codes-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/coin-master-free-spins-ios-2021_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/rbx-place-free-robux_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/coin-master-free-spins-fb-champion_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/pig-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/how-to-get-free-shields-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/hack-to-send-gold-cards-on-coin-master_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/coin-master-free-food_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/coin-master-hack-tool-v1-9-download-free_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/how-to-get-minecraft-for-free-on-mac_GM479516143.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
stream_003_off000049ac.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49AC 24548 bytes
SHA-256: 4f2282f2f5424115a6b50e1c4896e03a61567f2f373cd7ee9e9a2bc1a612e7a5
font_01_sfnt_off0000806b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x806B 18204 bytes
SHA-256: c2a793af59649bf4b843cbd99ee8be529ccee1be30d6b51226c82ac03537da05

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