Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb0ac28c678cabc5…

MALICIOUS

PDF

41.6 KB Created: 2021-05-16 01:39:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 9f4c0ad216aef4e6a9a8bca04846a6fc SHA-1: 12870fc105b104d391b89a07adfb9d46229aecbd SHA-256: fb0ac28c678cabc51aac898277ae1f89ddc89acddc64e40a7e72529bff5ea609
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, many of which are SEO-optimized PDF files, indicating a link farm or redirection scheme. The primary lure is related to 'free spins' and 'hacks' for games like Coin Master, suggesting a phishing or scam attempt. While no scripts were explicitly extracted, the PDF structure and embedded URIs strongly suggest a malicious intent to redirect users to potentially harmful content or exploit kits.

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/406889139/how-to-get-free-spins-on-coin-master-facebook-game-hack PDF link annotation
    • https://sitam.co.in/images/free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • https://sitam.co.in/images/coin-master-gameplay_GM406889139.pdfIn PDF document text
    • https://sitam.co.in/images/coin-master-hack-no-root_GM406889139.pdfIn PDF document text
    • https://sitam.co.in/images/free-spins-coin-master-2021-today_GM406889139.pdfIn PDF document text
    • https://sitam.co.in/images/coin-master-root-hack_GM406889139.pdfIn PDF document text
    • https://sitam.co.in/images/coin-master-twitter-free-spins_GM406889139.pdfIn PDF document text
    • https://sitam.co.in/images/coin-master-heaven-daily-free-spins-and-coins-links_GM406889139.pdfIn PDF document text
    • https://sitam.co.in/images/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://sitam.co.in/images/80-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://sitam.co.in/images/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • https://sitam.co.in/images/free-coin-master-gold-cards_GM406889139.pdfIn PDF document text
    • https://sitam.co.in/images/coin-master-hack-apk-download-2021_GM406889139.pdfIn PDF document text
    • https://sitam.co.in/images/2021-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://sitam.co.in/images/coin-master-free-spins-daily-2021_GM406889139.pdfIn PDF document text
    • https://sitam.co.in/images/roblox-promo-code-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://sitam.co.in/images/coin-master-daily-free-spins_GM406889139.pdfIn PDF document text
    • https://sitam.co.in/images/free-robux-download_GM431946152.pdfIn PDF document text
    • https://sitam.co.in/images/free-spins-coins-coin-master_GM406889139.pdfIn PDF document text
    • https://sitam.co.in/images/roblox-password-hacker_GM431946152.pdfIn PDF document text
    • https://sitam.co.in/images/hack-coin-master-site-rssingcom_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

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_003_off00004959.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4959 23908 bytes
SHA-256: 0f87ea0e44ad1fa9c0692c3a6b59da92cc2cbe2e5d70289bca788bb1a172e71e
font_01_sfnt_off00007fcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FCC 18380 bytes
SHA-256: 71bee5fb83ca58b21c1d24b393ac6a95aa3d07cb2aa8ee860216aa324e2c09d6

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