Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfdd5e83bc049164…

MALICIOUS

PDF

45.1 KB Created: 2021-06-03 08:05:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 81301d4bbe40f04da36ab6cfe94bf626 SHA-1: 6df258c91b7d9d09e42d56429c13cfc53cf4ee8c SHA-256: bfdd5e83bc04916449c73a43326094a7416212c2fba95398db05d088ec7aea3a
200 Risk Score

Malware Insights

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

This PDF document contains multiple links to known malicious redirectors and lures users with fake game hacks and free spins. The document displays a fake CAPTCHA or human verification prompt to trick users into interacting with the malicious links. The primary malicious URL identified is https://netcdn.online/app/406889139/free-spins-from-coin-master-game-hack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/406889139/free-spins-from-coin-master-game-hack In PDF document text
    • http://perpus.wdh.ac.id/repository/pokemon-go-free-accounts-2021_GM1094591345.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/coin-master-free-spins-hack-link_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/free-minecraft-videos_GM479516143.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/free-spins-on-coin-master-2021-ios_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/master-coin-master-free-spin_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/roblox-hack-tool_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/free-robux-com-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/free-robux-no-survey-or-human-verification_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/get-free-coin-master-coins_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/free-hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/pokemon-go-fake-gps_GM1094591345.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/coin-master-free-box_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/minecraft-story-mode-free_GM479516143.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/free-google-play-promo-codes-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/coin-master-hacks-android_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/moonactive-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/play-roblox-for-free-on-google_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/play-minecraft-pocket-edition-for-free_GM479516143.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/can-you-download-minecraft-for-free_GM479516143.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
stream_004_off00005271.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5271 25672 bytes
SHA-256: 9535af2634777bbdb1962fd948c0b435a8d2791681712545966a40c1ad28cdd1
font_01_sfnt_off00008e2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E2B 18148 bytes
SHA-256: a8179ab01d9f651dd6fb5ce3364ead5561884d8b40fe8a62eaf26fde05d0c646

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