Malicious PDF — malware analysis report

Static analysis result for SHA-256 c201435e0e1709de…

MALICIOUS

PDF

44.7 KB Created: 2021-06-03 20:25:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 21d6d1e5bd808f47d11808d22567327f SHA-1: a5596d1a5a01a1c8e0c883bcc61c5720657e2865 SHA-256: c201435e0e1709deb12e1daf35a6fbe0ae778a1111fe5a7c692eb62b8aea99a9
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and websites promising free game currency or hacks, such as 'robuxy-com-free-robux-game-hack'. The document body and embedded URLs strongly suggest a phishing or scam attempt designed to lure users to these sites. No scripts were extracted, but the presence of malicious links and the lure indicate a high likelihood of a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/431946152/robuxy-com-free-robux-game-hack In PDF document text
    • http://elibrary.perludem.org//repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/coin-master-free-spins-and-coins-link-haktuts_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/wurst-112_GM479516143.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/coin-master-hack-tool_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/rbxcity-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/free-coins-and-spins-2021_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/play-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/rblx-city-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/free-minecraft-skin-packs_GM479516143.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/robux-free-gift-card_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/get-robux_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/http-blackgamesus-coinmasterhack_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/coinmaster-rewards_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/coin-master-spins_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-roblox-accounts-with-builders-club_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/coin-master-hack-1021_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/free-robux-real-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/coinmaster-spins_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/free-robux-without-human-verification_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
stream_004_off000052fa.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52FA 24776 bytes
SHA-256: 6ce7c93616c09efa8eb931a33f09aefa513a61f83824aeb99637759604a83233
font_01_sfnt_off00008ba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BA3 18452 bytes
SHA-256: 502ad6067225007cfeab5155f8ca615546b56d7ab4478b734f537abd02c25d18

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