Malicious PDF — malware analysis report

Static analysis result for SHA-256 caf2647e3298f390…

MALICIOUS

PDF

45.1 KB Created: 2021-05-14 21:40:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a5a74a14e460653770339a613a5cb45b SHA-1: aa11b7ab3aff4c57be1d57d18b08c0e484fdee34 SHA-256: caf2647e3298f390f116828adc859c62527124fe2677fee0b26f51a52773d271
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9621

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/406889139/coin-master-free-spin-and-coin-link-today-game-hack PDF link annotation
    • http://greasley.online/images/how-to-get-free-coins-on-flip-master_GM406889139.pdfIn PDF document text
    • http://greasley.online/images/rblx-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://greasley.online/images/get-coin-master-spins-free_GM406889139.pdfIn PDF document text
    • http://greasley.online/images/coin-master-hack-apk-with-fb-login_GM406889139.pdfIn PDF document text
    • http://greasley.online/images/games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://greasley.online/images/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
    • http://greasley.online/images/free-spins-coin-master-no-verification_GM406889139.pdfIn PDF document text
    • http://greasley.online/images/como-hackear-coin-master_GM406889139.pdfIn PDF document text
    • http://greasley.online/images/how-to-hack-someones-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://greasley.online/images/free-robux-hack_GM431946152.pdfIn PDF document text
    • http://greasley.online/images/coin-master-links-for-free-spins_GM406889139.pdfIn PDF document text
    • http://greasley.online/images/daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://greasley.online/images/coin-master-hack-using-lucky-patcher_GM406889139.pdfIn PDF document text
    • http://greasley.online/images/free-robux-no-verification-2021-ios_GM431946152.pdfIn PDF document text
    • http://greasley.online/images/coin-master-free-spins-link-download_GM406889139.pdfIn PDF document text
    • http://greasley.online/images/free-robux-no-anti-bot-verification_GM431946152.pdfIn PDF document text
    • http://greasley.online/images/coin-master-free-spins-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://greasley.online/images/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://greasley.online/images/how-to-get-creative-mode-in-minecraft-server-hack_GM479516143.pdfIn PDF document text
    • http://greasley.online/images/free-roblox-clothes-templates_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004890.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4890 25164 bytes
SHA-256: 6a769dfdf98a73f26595b636ddeb9e8f91f365a0a3d70c92b81e112429868241
font_01_sfnt_off00008304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8304 3000 bytes
SHA-256: 2dc442bec2876772b2b8d4b50a4abf064217aa7912c99c219d8694ed3db7bda1
font_02_sfnt_off00008d64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D64 18412 bytes
SHA-256: 5606d742d49c2f618a839db89fb2f395f675f912dcc06d31cfc3972fb9700339