Malicious PDF — malware analysis report

Static analysis result for SHA-256 6144f54555caa342…

MALICIOUS

PDF

44.6 KB Created: 2021-06-03 13:12:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 46df12cf7640dcdda7ff620a2eaef565 SHA-1: 10ce64b702d21bcada7e8379124a1b08c7ac7a55 SHA-256: 6144f54555caa342cdfb80839f6b6ccfa374818e677aa56334d33f0245335f74
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, including a primary link identified as a malicious redirector. The document body and heuristic firings indicate a lure related to 'free Robux' or 'game hacks', suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a malicious intent to redirect users to potentially harmful content.

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/how-to-buy-robux-for-free-game-hack In PDF document text
    • http://librarysenior.com/repository/coinmaster-free-cards_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/free-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/how-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/free-minecraft-bedrock-server_GM479516143.pdfIn PDF document text
    • http://librarysenior.com//repository/coin-master-blogspot-links_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/free-daily-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/free-spins-coin-master-apple_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/robux-hack-tools_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/coin-master-free-spins-generator-no-verification_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/minecraft-games-online-free-no-download_GM479516143.pdfIn PDF document text
    • http://librarysenior.com/repository/free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/robux-hack_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/free-roblox-like-game_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/robuxmatch-com-free-robux_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/coin-master-hack-version-2021_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/free-spin-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/earnrobux_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/free-pokemon-go-joystick-2021_GM1094591345.pdfIn PDF document text
    • http://librarysenior.com//repository/free-robux-with-no-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_off0000512a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x512A 25156 bytes
SHA-256: a02998a45602b96d3470557038428707f096397750f232575255dd301adf08e1
font_01_sfnt_off00008b87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B87 18356 bytes
SHA-256: 42cf6025b0828d48dcef6abba26d08473f6f67d2383591dd07323470bab2f866

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