Malicious PDF — malware analysis report

Static analysis result for SHA-256 779cb1be1a643d96…

MALICIOUS

PDF

45.5 KB Created: 2021-05-19 10:09:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: a6901e897d4ce84b61badcecaa41f653 SHA-1: e59274111ce740f0153f9fca0eb901417e530954 SHA-256: 779cb1be1a643d965bfe292eb5eab348f719c878134a2392791a88f2d7b13953
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free generator / game hack' lures. The primary malicious URL identified is https://netcdn.xyz/app/431946152/free-robux-group-payouts-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly indicate a phishing or redirection attack, likely intended to deliver a second-stage payload or lead users to a credential harvesting site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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/431946152/free-robux-group-payouts-game-hack In PDF document text
    • http://zercalo.org/images/free-minecraft-servers-to-join_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/free-ways-to-get-robux_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/daily-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-key-free-spin_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/www-roblox-robux_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-free-gift-cards_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/minecraft-free-download-laptop_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/minecraft-free-version_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/roblox-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-hack-quora_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/rbx-place-free-robux_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-hack-link_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-free-coins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/try-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/minecraft-multiplayer-free_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/free-spins-and-coins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/is-there-a-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/robux-no-human-verification-2021_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_003_off0000494b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x494B 31104 bytes
SHA-256: e663df0543904bbdbc76de4ef630a8567dee833559a65798bed103e13c7613cc
font_01_sfnt_off00008e16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E16 18856 bytes
SHA-256: ce567b12c15b2d80af346f88522d5e97efe0146d8ef1a381d9680522b282c106

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