Malicious PDF — malware analysis report

Static analysis result for SHA-256 1698af590a27253b…

MALICIOUS

PDF

34.3 KB Created: 2021-07-09 17:01:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: f274a64cf19cf8bfa061fc8247e13958 SHA-1: 555f88cae071219c518498e903b368b8576d7f7e SHA-256: 1698af590a27253b969c0fd831a463232cc695faea88ce072b1ac64244b05b12
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 0.9980

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 http://netcdn.tw/app/479516143/minecraft-pe-hacks-ios-game-hack PDF link annotation
    • http://www.bestbist.com/assets/uploads/pages/files/free-robux-no-download_GM431946152.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/best-free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/coin-master-apk-free-download_GM406889139.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/free-spin-links-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/google-how-do-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/wizard-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/coin-master-free-spins-and-coins-daily_GM406889139.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/free-robux-link_GM431946152.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/roblox-hack-safe_GM431946152.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/free-boy-hair-roblox_GM431946152.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/tbc-oil-platform-roblox-free-download_GM431946152.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/free-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/coin-master-free-download-for-pc_GM406889139.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/completely-red-pants-for-roblox-free_GM431946152.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/coin-master-daily-free-spins-link-march-2021_GM406889139.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/daily-free-spin-coin-master-link_GM406889139.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/http-blackgamesus-coinmasterhack_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
font_00_sfnt_off0000329e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x329E 22112 bytes
SHA-256: ba5048069625eaa1f4f48d13789b0a8901d3fae474ad8af9d04a911499f086e7
font_01_sfnt_off0000636d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x636D 18320 bytes
SHA-256: 7d84f67f656a26b257965eaa88f51ac3ee81fd92679c35102939931f4214227c

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