Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba049df22b6e9869…

MALICIOUS

PDF

42.9 KB Created: 2021-05-13 07:04:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: a853311b1577af8403ade937f1636a2c SHA-1: 650c607962acde039bc12ee8eaa98f9228ddf228 SHA-256: ba049df22b6e9869f1d0ec0b531c23384a9a63d7f1a9c8f27a9847de3be36171
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are disguised as game hacks or generators for popular games like Minecraft and Roblox. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, suggesting a link farm or redirector strategy. The primary URL, 'https://netcdn.xyz/app/479516143/free-op-minecraft-servers-game-hack', is directly associated with a game hack lure. While no scripts were explicitly extracted, the nature of the links and the 'ML_NYX_PDF_MALICIOUS' flag strongly suggest the intent is to redirect users to malicious sites for malware downloads or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/479516143/free-op-minecraft-servers-game-hack PDF link annotation
    • https://www.tiancom.com.tw/upload/files/coin-master-el-tiger-card-free_GM406889139.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/coin-master-facebook_GM406889139.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/haktuts-coin-master-free-spin-today_GM406889139.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/free-spin-coin-master-iphone_GM406889139.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/hack-crack-for-coin-master-currency_GM406889139.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/free-spins-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/how-to-download-minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/coin-master-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/roblox-password-hacker_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/free-robux-com_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/free-robux-com-roblox_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/free-robux-no-verification-no-download-2021_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/coin-master-hack-version-download-2021_GM406889139.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/how-to-make-a-minecraft-pe-server-for-free_GM479516143.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/coin-master-free-spins-link-hack_GM406889139.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/free-robux-website_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/today-free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/roblox-mobile-hack_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/how-to-get-free-robux-gift-cards_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_off00004c5a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C5A 25592 bytes
SHA-256: f2319af19cb1229b0164f7b314dadbb37081ba5c11b686ba8b47adb160109868
font_01_sfnt_off000086ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86CA 17856 bytes
SHA-256: a77b7ff2a68dfc8683e01ffa7febdd478081a7961822aa2eebc6e1611696765c