Malicious PDF — malware analysis report

Static analysis result for SHA-256 0521d60108ff0278…

MALICIOUS

PDF

44.5 KB Created: 2021-06-08 22:56:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 61f13939f10c1d5cbdbe9498bc3c077a SHA-1: 8c281814be30ee312b46852567f7ddf6f2db6177 SHA-256: 0521d60108ff027817d94b655023d3c35ccad23df9585746ba1a410e881dee7d
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 a "free Robux hack generator" lure. The presence of a visual download button and the ML classifier's high confidence score further support the malicious nature of this document. The embedded links are designed to trick users into visiting potentially harmful websites.

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.tw/app/431946152/free-robux-hack-generator-no-survey-no-human-verification-game-hack In PDF document text
    • http://armportal.co.uk/images/how-do-you-get-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://armportal.co.uk/images/grabpoints-robux_GM431946152.pdfIn PDF document text
    • http://armportal.co.uk/images/free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • http://armportal.co.uk/images/hacked-roblox-game_GM431946152.pdfIn PDF document text
    • http://armportal.co.uk/images/free-attacks-on-coin-master_GM406889139.pdfIn PDF document text
    • http://armportal.co.uk/images/free-robux-hack_GM431946152.pdfIn PDF document text
    • http://armportal.co.uk/images/free-roblox-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • http://armportal.co.uk/images/how-to-download-minecraft-for-free-on-your-phone_GM479516143.pdfIn PDF document text
    • http://armportal.co.uk/images/coin-master-hack-spins-free_GM406889139.pdfIn PDF document text
    • http://armportal.co.uk/images/roblox-games-with-free-radio_GM431946152.pdfIn PDF document text
    • http://armportal.co.uk/images/coin-master-free-download-app_GM406889139.pdfIn PDF document text
    • http://armportal.co.uk/images/how-to-get-free-gamepasses-on-roblox_GM431946152.pdfIn PDF document text
    • http://armportal.co.uk/images/ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://armportal.co.uk/images/minecraft-bedrock-free_GM479516143.pdfIn PDF document text
    • http://armportal.co.uk/images/coin-master-free-spins-may-11-2021_GM406889139.pdfIn PDF document text
    • http://armportal.co.uk/images/free-minecraft-java-account_GM479516143.pdfIn PDF document text
    • http://armportal.co.uk/images/free-robux-no-verify-2021_GM431946152.pdfIn PDF document text
    • http://armportal.co.uk/images/appsmob-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://armportal.co.uk/images/free-minecraft-coins_GM479516143.pdfIn PDF document text
    • http://armportal.co.uk/images/free-robux-discord_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 5

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_off0000501b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x501B 24416 bytes
SHA-256: 09ef22a0503cc691938bbb8e8935f60b4804710c8a08a407cc4e0bf67bf364dc
font_01_sfnt_off0000883d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x883D 19324 bytes
SHA-256: 6bfe3619fecb79a10ac4bbfa5ac65e648d6549279f7a82ac85ece4fdf5d168f2

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