Malicious PDF — malware analysis report

Static analysis result for SHA-256 62b41d5050289317…

MALICIOUS

PDF

34.3 KB Created: 2021-07-04 08:20:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 9a4dad7c3b0f0b552df8cf1facafa1f5 SHA-1: d46a061481a675bc28f147096395f110fb87514e SHA-256: 62b41d505028931700c1a5bde060110ce3cce12fd387e9a436c983b6783d2218
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/431946152/can-i-get-robux-for-free-game-hack PDF link annotation
    • https://www.kis.ac.th/kis_international/assets/uploads/img/all/files/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • https://www.kis.ac.th/kis_international/assets/uploads/img/all/files/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.kis.ac.th/kis_international/assets/uploads/img/all/files/how-to-get-free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • https://www.kis.ac.th/kis_international/assets/uploads/img/all/files/how-to-get-unlimited-robux_GM431946152.pdfIn PDF document text
    • https://www.kis.ac.th/kis_international/assets/uploads/img/all/files/rbx-land-free-robux_GM431946152.pdfIn PDF document text
    • https://www.kis.ac.th/kis_international/assets/uploads/img/all/files/free-daily-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.kis.ac.th/kis_international/assets/uploads/img/all/files/free-robux-tips-and-tricks_GM431946152.pdfIn PDF document text
    • https://www.kis.ac.th/kis_international/assets/uploads/img/all/files/minecraft-pe-free-download-ios_GM479516143.pdfIn PDF document text
    • https://www.kis.ac.th/kis_international/assets/uploads/img/all/files/how-to-speed-hack-in-legendary-football-roblox_GM431946152.pdfIn PDF document text
    • https://www.kis.ac.th/kis_international/assets/uploads/img/all/files/how-do-i-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.kis.ac.th/kis_international/assets/uploads/img/all/files/mosttechs-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.kis.ac.th/kis_international/assets/uploads/img/all/files/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://www.kis.ac.th/kis_international/assets/uploads/img/all/files/coin-master-spin-and-coins-free_GM406889139.pdfIn PDF document text
    • https://www.kis.ac.th/kis_international/assets/uploads/img/all/files/coin-master-cheat-codes-free_GM406889139.pdfIn PDF document text
    • https://www.kis.ac.th/kis_international/assets/uploads/img/all/files/coin-master-hack-2021-ios-download_GM406889139.pdfIn PDF document text
    • https://www.kis.ac.th/kis_international/assets/uploads/img/all/files/minecraft-hack-app_GM479516143.pdfIn PDF document text
    • https://www.kis.ac.th/kis_international/assets/uploads/img/all/files/roblox-hack-app_GM431946152.pdfIn PDF document text
    • https://www.kis.ac.th/kis_international/assets/uploads/img/all/files/how-to-get-minecraft-for-free-on-iphone-2021_GM479516143.pdfIn PDF document text
    • https://www.kis.ac.th/kis_international/assets/uploads/img/all/files/win-free-robux_GM431946152.pdfIn PDF document text
    • https://www.kis.ac.th/kis_international/assets/uploads/img/all/files/rbxcity-free-robux-instant-payout_GM431946152.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_off0000312f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x312F 22008 bytes
SHA-256: 25cd9e9a4fce7d590b27937cf2b19cc5ab0cda31e9d6a11e18178409e768479b
font_01_sfnt_off00006197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6197 18820 bytes
SHA-256: a8ebb2e02c07fcee768b9c7d2548d14d4f98ce7ae4a3dab28d470086f2c44dd3

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