Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ee136b64f2e3eb6…

MALICIOUS

PDF

46.5 KB Created: 2021-06-04 01:50:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: c4f87607e89a6b17e5166dacdb683fbe SHA-1: 1165905ebf14d1d51baa8b44339df976e87b3a48 SHA-256: 4ee136b64f2e3eb615585be695f2d6fff44d9bc8c4af52f619ecf78a6724b2e4
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains multiple links to known malicious redirectors, disguised as game hacks and free item generators. The document body and heuristics indicate a fake CAPTCHA or human verification prompt is presented to trick users into interacting further. The primary malicious URL identified is https://netcdn.online/app/431946152/how-to-get-free-roblox-items-game-hack, which is likely used to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9748

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.online/app/431946152/how-to-get-free-roblox-items-game-hack In PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/free-coins-coin-master-daily_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/free-robux-link_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/wurst_GM479516143.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/do-coin-master-hacks-work_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/where-can-i-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/free-minecraft-mods_GM479516143.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/free-minecraft-bedrock-server-hosting_GM479516143.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/village-coin_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/coin-master-hack-2021-no-survey_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/real-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/minecraft-hacker-mask_GM479516143.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/coin-master-200-spin-link_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/free-roblox-shirt-templates-2021_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/roblox-but_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/how-to-get-minecraft-for-free-on-laptop_GM479516143.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/minecraft-logo-maker-free_GM479516143.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/coin-master-hack-blogspot_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/free-roblox-clothes-and-hair_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004c87.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C87 24652 bytes
SHA-256: 3b38991caaf298e0db5f57ed31d34a3b4bfa6eee262ca5ec34bd3d57749d56c4
font_01_sfnt_off00008594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8594 3608 bytes
SHA-256: 38b270e1156baf55f52eefd6c0272d25f41d6b4ef7b6a9aa3301989c4dacee27
font_02_sfnt_off0000921d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x921D 18476 bytes
SHA-256: 8f186cfffdac824b8af051e9c3258ff2c6bc2a624daaf9438b2e2390608ff8bc

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