Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1a6d535137f2437…

MALICIOUS

PDF

34.8 KB Created: 2021-06-19 03:02:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: b0c34d7bd5a1212ae1ca9f349ff6bfda SHA-1: 6af7097ed81ef3db084abf268929cf683fa58e2d SHA-256: f1a6d535137f2437ac0972d393bb1c6a430d7471056f1a5433cacea47478a0c1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded URLs that lead to a known malicious redirector infrastructure, specifically advertising free Robux for Roblox. The document body and heuristics indicate a lure for game-related cheats or currency. Although no scripts were extracted, the presence of malicious redirector links and the lure suggest the document is intended to lead the user to a malicious site, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/roblox-free-robux-android-1-game-hack In PDF document text
    • https://silvterie.com.br/images/ckfinder/files/websites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/free-spins-coin-master-no-verification_GM406889139.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/minecraft-java-free-trial_GM479516143.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/free-robux-promo-codes-november-2021_GM431946152.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/free-spin-and-coin-blogspot-com_GM406889139.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/free-robux-with-no-human-verification_GM431946152.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/coin-master-hack-online-pc_GM406889139.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/how-to-put-hack-script-to-roblox-parkour_GM431946152.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/free-robux-apps-that-work_GM431946152.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/hack-lua-script-for-one-peace-opn-seas-roblox_GM431946152.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/roblox-jailbreak-hack_GM431946152.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/login-robux_GM431946152.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/give-me-free-robux_GM431946152.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/how-to-get-free-robux-without-verifying-2021_GM431946152.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/free-robux-no-offers_GM431946152.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/coin-master-hack-spins-free_GM406889139.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/roblox-gift-card-for-free_GM431946152.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/minecraft-kill-aura_GM479516143.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/roblox-health-hack-code_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_off00003050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3050 22536 bytes
SHA-256: 89d6a4742d1cd6c48efdbe1acf8481416d7d6f236105dd01003108997869fd51
font_01_sfnt_off00006279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6279 19192 bytes
SHA-256: 29d63e64bd4766d3ff98c29858d30e7794f4b1c8fe5e431cf12924256785d17c

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