Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4d99da5f6890ee4…

MALICIOUS

PDF

44.3 KB Created: 2021-06-13 21:46:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: c335fa0aaeebe6cf3d1d852a0ec59b82 SHA-1: ca5cfa662fc6529d8176a84afb5d14a7146f8311 SHA-256: c4d99da5f6890ee47ff75063a5321cca2a6052b0f40d4a2f263793987e9bf357
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. It uses brand-impersonation credential phishing and an urgency-based lure. The file 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 6

  • 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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: http://netcdn.co/app/431946152/robux-mod-hack-game-hack.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.co/app/431946152/robux-mod-hack-game-hack PDF link annotation
    • http://thinkpro.ca/wp-content/uploads/fsqm-files/ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://thinkpro.ca/wp-content/uploads/fsqm-files/roblox-free-hair-catalog_GM431946152.pdfIn PDF document text
    • http://thinkpro.ca/wp-content/uploads/fsqm-files/when-will-roblox-liberty-county-be-free_GM431946152.pdfIn PDF document text
    • http://thinkpro.ca/wp-content/uploads/fsqm-files/tiktok-likes-free_GM835599320.pdfIn PDF document text
    • http://thinkpro.ca/wp-content/uploads/fsqm-files/how-to-hack-peoples-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://thinkpro.ca/wp-content/uploads/fsqm-files/roblox-free-items-glitch-2021_GM431946152.pdfIn PDF document text
    • http://thinkpro.ca/wp-content/uploads/fsqm-files/free-roblox-accounts-20212021_GM431946152.pdfIn PDF document text
    • http://thinkpro.ca/wp-content/uploads/fsqm-files/free-robux-counter-for-roblox-apk_GM431946152.pdfIn PDF document text
    • http://thinkpro.ca/wp-content/uploads/fsqm-files/roblox-hacked-client-buy_GM431946152.pdfIn PDF document text
    • http://thinkpro.ca/wp-content/uploads/fsqm-files/roblox-hack-tool-no-survey_GM431946152.pdfIn PDF document text
    • http://thinkpro.ca/wp-content/uploads/fsqm-files/how-to-get-free-robux-and-free-tix-on-roblox_GM431946152.pdfIn PDF document text
    • http://thinkpro.ca/wp-content/uploads/fsqm-files/roblox-hack-the-bank_GM431946152.pdfIn PDF document text
    • http://thinkpro.ca/wp-content/uploads/fsqm-files/roblox-button-simulator-3-hack-script_GM431946152.pdfIn PDF document text
    • http://thinkpro.ca/wp-content/uploads/fsqm-files/free-tiktok-likes-trial_GM835599320.pdfIn PDF document text
    • http://thinkpro.ca/wp-content/uploads/fsqm-files/free-robux-without-human-verification-or-downloads_GM431946152.pdfIn PDF document text
    • http://thinkpro.ca/wp-content/uploads/fsqm-files/free-roblox-gift-cards-2021_GM431946152.pdfIn PDF document text
    • http://thinkpro.ca/wp-content/uploads/fsqm-files/rexex-free-robux_GM431946152.pdfIn PDF document text
    • http://thinkpro.ca/wp-content/uploads/fsqm-files/roblox-cheat-engine-dragon-ball-rage_GM431946152.pdfIn PDF document text
    • http://thinkpro.ca/wp-content/uploads/fsqm-files/comment-hack-roblox-2021_GM431946152.pdfIn PDF document text
    • http://thinkpro.ca/wp-content/uploads/fsqm-files/how-to-play-roblox-for-free-no-download_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_off00004de2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4DE2 26580 bytes
SHA-256: a4528ff1a77e78087ea1396bcb31caa447e038e474dec9f025fe38d3fddda4b0
font_01_sfnt_off000089de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89DE 18620 bytes
SHA-256: 83e1296c33402df4861f3eebe36a27176a6f190c5e9d0e869ce289bd42a1cbda

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