Malicious PDF — malware analysis report

Static analysis result for SHA-256 c739617cbf31b191…

MALICIOUS

PDF

43.2 KB Created: 2021-05-14 11:13:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 56f8e7ce42fad8941a1cc5a9b31387a0 SHA-1: 5367ab6b0f91c7e2e8d7227908d102582cae8d4c SHA-256: c739617cbf31b19132cc4a96675edb73d30506d03d3b20c8b73e033dc10ed645
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, including a primary lure for 'coin master free spins' and game hacks. It also hosts a large number of other PDF files, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicates maliciousness, and the overall structure points to a phishing or scam attempt designed to drive traffic to malicious or ad-heavy sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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-spins--game-hack PDF link annotation
    • https://studentcareerinfo.com/images/a-lot-of-robux_GM431946152.pdfIn PDF document text
    • https://studentcareerinfo.com/images/how-do-i-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://studentcareerinfo.com/images/free-spins-coin-master-haktuts_GM406889139.pdfIn PDF document text
    • https://studentcareerinfo.com/images/how-to-get-free-robux-codes_GM431946152.pdfIn PDF document text
    • https://studentcareerinfo.com/images/free-online-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://studentcareerinfo.com/images/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • https://studentcareerinfo.com/images/free-executors-for-roblox_GM431946152.pdfIn PDF document text
    • https://studentcareerinfo.com/images/minecraft-windows-10-hacks_GM479516143.pdfIn PDF document text
    • https://studentcareerinfo.com/images/how-to-earn-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • https://studentcareerinfo.com/images/how-to-get-free-minecraft-skins_GM479516143.pdfIn PDF document text
    • https://studentcareerinfo.com/images/coin-master-hack-without-verification-code_GM406889139.pdfIn PDF document text
    • https://studentcareerinfo.com/images/coin-master-spin-rewards_GM406889139.pdfIn PDF document text
    • https://studentcareerinfo.com/images/robux-hack-tools_GM431946152.pdfIn PDF document text
    • https://studentcareerinfo.com/images/get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://studentcareerinfo.com/images/i-need-more-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://studentcareerinfo.com/images/how-to-get-free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • https://studentcareerinfo.com/images/coin-master-time-hack_GM406889139.pdfIn PDF document text
    • https://studentcareerinfo.com/images/minecraft-build-hacks_GM479516143.pdfIn PDF document text
    • https://studentcareerinfo.com/images/how-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://studentcareerinfo.com/images/robux-hack-no-human-verification_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
stream_003_off00004928.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4928 27452 bytes
SHA-256: 515345988d7097f1a30b0290b6fe2294a3796ad370d07fac8a2d34ce7fefb0a9
font_01_sfnt_off000087fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87FE 17884 bytes
SHA-256: 7b855ef2bb944b5b370c61480927ccad63ff31bdbf820bc1f0da9d35a10f5fb2

Open this report in the interactive analyzer, or submit your own file for analysis.