Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf240d13928b30dc…

MALICIOUS

PDF

42.6 KB Created: 2021-05-12 11:01:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 17e805a6aa849921aa43be98561d1d38 SHA-1: 5d7f3ab1e375f40003de781e2ca258e30c0096e1 SHA-256: cf240d13928b30dc7ab3e6e6198d8627673d90937f7d1c82ce2b6c6b11b7e83b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains embedded links that redirect to a malicious URL, likely intended to lure users into downloading further malware or engaging in scams. The document body and heuristics indicate a focus on 'free Robux' and 'game hacks', a common social engineering tactic. Although no scripts were directly extracted, the presence of malicious redirector links and the ML classifier's high confidence suggest a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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/431946152/free-robux-today-game-hack In PDF document text
    • http://www.sharp-calculators.com/files/ckfinder/files/i-cant-get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.sharp-calculators.com/files/ckfinder/files/can-you-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://www.sharp-calculators.com/files/ckfinder/files/free-promo-codes-roblox_GM431946152.pdfIn PDF document text
    • http://www.sharp-calculators.com/files/ckfinder/files/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://www.sharp-calculators.com/files/ckfinder/files/roblox-free-vip-server_GM431946152.pdfIn PDF document text
    • http://www.sharp-calculators.com/files/ckfinder/files/get-coin-master-free-spin_GM406889139.pdfIn PDF document text
    • http://www.sharp-calculators.com/files/ckfinder/files/coin-master-daily-spin-link_GM406889139.pdfIn PDF document text
    • http://www.sharp-calculators.com/files/ckfinder/files/coin-master-free-spins-gratis_GM406889139.pdfIn PDF document text
    • http://www.sharp-calculators.com/files/ckfinder/files/how-to-get-free-chest-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.sharp-calculators.com/files/ckfinder/files/minecraft-xbox-one-free_GM479516143.pdfIn PDF document text
    • http://www.sharp-calculators.com/files/ckfinder/files/codes-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.sharp-calculators.com/files/ckfinder/files/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
    • http://www.sharp-calculators.com/files/ckfinder/files/free-robux-with-no-survey_GM431946152.pdfIn PDF document text
    • http://www.sharp-calculators.com/files/ckfinder/files/wurst-hacked-client_GM479516143.pdfIn PDF document text
    • http://www.sharp-calculators.com/files/ckfinder/files/free-face-roblox_GM431946152.pdfIn PDF document text
    • http://www.sharp-calculators.com/files/ckfinder/files/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://www.sharp-calculators.com/files/ckfinder/files/free-robux-thumbnail_GM431946152.pdfIn PDF document text
    • http://www.sharp-calculators.com/files/ckfinder/files/static-moonactive-net-link_GM406889139.pdfIn PDF document text
    • http://www.sharp-calculators.com/files/ckfinder/files/real-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://www.sharp-calculators.com/files/ckfinder/files/free-coins-coin-master-link_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_off00004a43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A43 24688 bytes
SHA-256: f3d4c4e28ef03883a2f20bdfa9ed903989e876dda2604e0e59f4f1e6d9b5bbf9
font_01_sfnt_off00008301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8301 18596 bytes
SHA-256: 123b3c01001442c78a22a4b95c046930f1463c344676a890e106be4cc216f6f4

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