Malicious PDF — malware analysis report

Static analysis result for SHA-256 67d4d970d1589894…

MALICIOUS

PDF

52.1 KB Created: 2021-06-03 11:15:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: ae93cf2c72a0097a3153a36a7af25ae6 SHA-1: e61366ab08b276541414d73a4dd7082b4e5e451c SHA-256: 67d4d970d158989427011c09c763df74e3a1d0cffefd4ad9298d12ffbf5cae48
260 Risk Score

Malware Insights

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

This PDF document employs a fake CAPTCHA lure to trick users into clicking malicious links, disguised as game hacks and generators. The document contains numerous links to external PDF files and a primary redirector URL, suggesting an attempt to lead the user to potentially harmful content or further exploitation. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9657

Heuristics 6

  • 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.
  • 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/406889139/how-do-i-get-free-spins-in-coin-master-game-hack In PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-ios-hack-download_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-roblox-accounts-with-robux-that-work-not-banned-2021_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/hack-game-plus-com-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-free-spins-cheat_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-free-coins-and-spins-today_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-pet-food-hack_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-minecraft-severs_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-free-cards-hack_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/minecraft-ps4-code-free_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-do-we-get-free-robux_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/best-free-roblox-executor_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/roblox-apocalypse-rising-hack_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-robux_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-robux-on-phone_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-free-spin-realme-products_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-robux-rewards_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/minecraft-free-download-mac-full-version-2021_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000517f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x517F 24468 bytes
SHA-256: 316bfc1f1605c119013e2d545ea2005c2097ec57d2056c1bc7b4c612f38894e7
font_01_sfnt_off00008977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8977 4020 bytes
SHA-256: 7d3617ecf51e14e6cffc9372c4441988c3b6cb3ea010f7512aee6af842ef388d
font_02_sfnt_off000096fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x96FD 7332 bytes
SHA-256: d811e0aca85f3b94c42cd1240eec68b8eb378f3d8be5e408d3f6abd0f11f834d
font_03_sfnt_off0000a916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA916 18216 bytes
SHA-256: b027c2a021bab7014740c7b31d1151edd7292f7703eb7b510e8af7521ebdade3

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