Malicious PDF — malware analysis report

Static analysis result for SHA-256 85278d115234b25e…

MALICIOUS

PDF

45.7 KB Created: 2021-06-02 18:36:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: ae975888f7a856012e5d7512ac9c6852 SHA-1: 7eca8daefe28eacce7c4a997c7a731f974e64137 SHA-256: 85278d115234b25eea2c45aff1e7c9a5372c009d972448a8f833ab4a60a5ff7c
220 Risk Score

Malware Insights

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

The PDF contains numerous links designed to appear as generators or hacks for popular games, such as Robux for Roblox and spins for Coin Master. These links redirect to potentially malicious infrastructure, including the URL https://netcdn.xyz/app/431946152/how-to-get-free-robux-by-playing-meep-city-game-hack. The presence of a visual download button lure further supports a malicious intent to trick users into clicking through to compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/how-to-get-free-robux-by-playing-meep-city-game-hack In PDF document text
    • http://solidcommunication.ch/images/how-to-play-minecraft-with-friends-for-free_GM479516143.pdfIn PDF document text
    • http://solidcommunication.ch/images/how-to-get-free-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://solidcommunication.ch/images/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • http://solidcommunication.ch/images/free-coin-master-spins-link_GM406889139.pdfIn PDF document text
    • http://solidcommunication.ch/images/coin-master-free-spins-and-coins-blogspot_GM406889139.pdfIn PDF document text
    • http://solidcommunication.ch/images/play-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://solidcommunication.ch/images/minecraft-bedrock-download-pc-free_GM479516143.pdfIn PDF document text
    • http://solidcommunication.ch/images/how-to-get-free-gamepasses-on-roblox_GM431946152.pdfIn PDF document text
    • http://solidcommunication.ch/images/free-robux-website_GM431946152.pdfIn PDF document text
    • http://solidcommunication.ch/images/hacks-master-coin_GM406889139.pdfIn PDF document text
    • http://solidcommunication.ch/images/minecraft-images-free_GM479516143.pdfIn PDF document text
    • http://solidcommunication.ch/images/free-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • http://solidcommunication.ch/images/free-robux-no-gift-card_GM431946152.pdfIn PDF document text
    • http://solidcommunication.ch/images/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • http://solidcommunication.ch/images/free-spins-coin-master-daily_GM406889139.pdfIn PDF document text
    • http://solidcommunication.ch/images/worst-client_GM479516143.pdfIn PDF document text
    • http://solidcommunication.ch/images/free-robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://solidcommunication.ch/images/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://solidcommunication.ch/images/free-coin-master-spins-for-today_GM406889139.pdfIn PDF document text
    • http://solidcommunication.ch/images/coin-master-free-spin-27_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 7

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004f62.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F62 26828 bytes
SHA-256: e901bdc46a4fc025e8321fe0f30fecf35cb4e57c686b0d7f9b1f389cf42c6eab
font_01_sfnt_off00008be4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BE4 19696 bytes
SHA-256: 3f5609e735aec94002a456c34c0a879db2893790d0d8c2800fe03fa4a4a17ff3

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