Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f4f2d8c1cf24f90…

MALICIOUS

PDF

42.4 KB Created: 2021-05-15 13:19:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: a090f4a4aa5f889edbf7c254ef6a43ed SHA-1: 54a42d672a58e5811c61a533f75120d7ac4fd18f SHA-256: 3f4f2d8c1cf24f9020658f7d87a8dbe2df74ab26bda62b9f0f0f18a60b1c37d3
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links, including a critical link to a known malicious redirector infrastructure at `https://netcdn.xyz/app/406889139/hack-coin-master-without-verification-game-hack`. The document body and heuristics indicate a lure related to "game hacks" and "free generators", suggesting a phishing or malware distribution attempt. The presence of many linked PDFs also points to a link farm designed to attract traffic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/406889139/hack-coin-master-without-verification-game-hack In PDF document text
    • http://aiyta.com/images/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://aiyta.com/images/roblox-admin-hack_GM431946152.pdfIn PDF document text
    • http://aiyta.com/images/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • http://aiyta.com/images/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://aiyta.com/images/robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://aiyta.com/images/how-to-get-free-skins-in-minecraft_GM479516143.pdfIn PDF document text
    • http://aiyta.com/images/coin-master-daily-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://aiyta.com/images/get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://aiyta.com/images/claimrbx-free-robux_GM431946152.pdfIn PDF document text
    • http://aiyta.com/images/coin-master-free-spins-haktuts_GM406889139.pdfIn PDF document text
    • http://aiyta.com/images/coin-master-hack-for-ios_GM406889139.pdfIn PDF document text
    • http://aiyta.com/images/google-roblox-games_GM431946152.pdfIn PDF document text
    • http://aiyta.com/images/free-100-robux_GM431946152.pdfIn PDF document text
    • http://aiyta.com/images/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://aiyta.com/images/hack-coin-master-game-apk-download_GM406889139.pdfIn PDF document text
    • http://aiyta.com/images/how-to-get-free-robux-no-scam_GM431946152.pdfIn PDF document text
    • http://aiyta.com/images/how-can-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://aiyta.com/images/roblox-studio-free-download_GM431946152.pdfIn PDF document text
    • http://aiyta.com/images/coin-master-heaven-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://aiyta.com/images/how-to-get-free-robux-without-email_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_off00004abd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4ABD 24904 bytes
SHA-256: 29355f8f254a7cd1df48b0d540cc9e7efb66ac77aecada1b5b800fcd4cc50155
font_01_sfnt_off0000832b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x832B 18356 bytes
SHA-256: aefaa71949a7bdb31c5263769784b91b60fa36dc046093ce5bdaf3e1e31da4c1