Malicious PDF — malware analysis report

Static analysis result for SHA-256 b20cd2a4aaa7c52a…

MALICIOUS

PDF

34.6 KB Created: 2021-06-20 01:27:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 79b75d1d6532d317002a5bc884676257 SHA-1: 306d125e546e8046f291fad30375cd7a2bdd27b0 SHA-256: b20cd2a4aaa7c52a533c96cf7667e9e5f2bf59ca32603dcf723425dfeddc6b21
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one to a known malicious redirector, designed to lure users with promises of free game currency or hacks. The document body and heuristics indicate a scam or phishing attempt, likely leading to a second-stage download or credential harvesting. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • 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.
  • 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/earn-free-robux-instantly-game-hack In PDF document text
    • http://slims.abulyatama.ac.id/repository/coin-master-free-spin-daily-link_GM406889139.pdfIn PDF document text
    • http://slims.abulyatama.ac.id//repository/coin-master-heaven-free-spins-today_GM406889139.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/roblox-catalog-free_GM431946152.pdfIn PDF document text
    • http://slims.abulyatama.ac.id//repository/coin-master-hack-cheat-generator-coins-and-spins-unlimited_GM406889139.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/coin-master-hack-apk-android-1_GM406889139.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/free-robux-admin-panel-twitter_GM431946152.pdfIn PDF document text
    • http://slims.abulyatama.ac.id//repository/coin-master-free-spins-facebook_GM406889139.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/free-robux-card-codes_GM431946152.pdfIn PDF document text
    • http://slims.abulyatama.ac.id//repository/mcpe-master-unlimited-coins-free-download_GM406889139.pdfIn PDF document text
    • http://slims.abulyatama.ac.id//repository/how-to-get-free-clothes-on-roblox_GM431946152.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/free-robux-no-human-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/free-roblox-usernames-and-passwords_GM431946152.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/cheats-roblox-survivor_GM431946152.pdfIn PDF document text
    • http://slims.abulyatama.ac.id//repository/how-to-get-minecraft-bedrock-for-free_GM479516143.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/coin-master-gameplay_GM406889139.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/how-to-get-free-food-for-foxy-in-coin-master_GM406889139.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/roblox-elemental-battlegrounds-diamond-hack_GM431946152.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/where-can-i-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/robux-free-online_GM431946152.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/fray-roblox-hack_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3096 22416 bytes
SHA-256: 7c1a4805c46fa60b9c2dc7ae7c8b36c544ea6e2f1e9128002eca874a4d64335e
font_01_sfnt_off0000622c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x622C 19072 bytes
SHA-256: 2f99a56d35cb14bcc53658b2d8bfa26a1d507fd65db0359024d1f89d9d51481f

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