Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5ec8822c2cf4ca5…

MALICIOUS

PDF

33.9 KB Created: 2021-06-18 12:46:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 39cd537886756ba41ead76d02beab4e1 SHA-1: 550fd273bafb287e822d1e14edb4ea852ebdf78e SHA-256: a5ec8822c2cf4ca56e2e27359f5cb02ffa026847606c93a44d2939309e7bfd97
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to external websites, including a primary link to 'netcdn.co' which is identified as a malicious redirector. The document body and heuristics indicate a lure for game hacks or generators, suggesting the intent is to trick users into downloading potentially malicious content. No scripts were extracted, but the embedded URLs and the nature of the lure strongly suggest a phishing or malware distribution attempt.

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/how-to-be-spongebob-in-roblox-for-free-game-hack In PDF document text
    • http://zercalo.org/images/coin-master-link-daily-get-free-spins-amp_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/how-to-get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/free-robux-wheel_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-free-download_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-free-gold-cards-link-2021ee-spins_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/free-robux-sign_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/free-modded-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/free-tiktok-fans-hack_GM835599320.pdfIn PDF document text
    • http://zercalo.org/images/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/tiktok-follower-bot-free_GM835599320.pdfIn PDF document text
    • http://zercalo.org/images/https-rbx-place-rewards_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/free-roblox-promo-codes-2021-june_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/how-do-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/how-to-get-minecraft-for-free-ios_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/roblox-speed-hack-tool_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/free-robux-no-scam_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-hack-link_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/freer-pro-tiktok_GM835599320.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-free-spins-hack-ios_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_off000030d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30D4 21628 bytes
SHA-256: ea0e12ed5ab79d06b2cf91ef0c2e35466d1f5f8a0bb9f3d306af72f2d10413e6
font_01_sfnt_off00006025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6025 18804 bytes
SHA-256: 2f6b010bc442b388706eddac9af9e126c8ddf91d039eb9476f23c30d2c85122f

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