Malicious PDF — malware analysis report

Static analysis result for SHA-256 40fc328c27d79067…

MALICIOUS

PDF

43.5 KB Created: 2021-06-03 08:58:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 7178df9e7ba30a144919f9ebcf6a9ff6 SHA-1: 4a33c020eba72923c84053aa07e97cd0dfcc18f7 SHA-256: 40fc328c27d79067b13df98dd39af6860f3f8839897876906d07ef1a61ff4410
320 Risk Score

Malware Insights

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

This PDF document employs social engineering tactics, presenting fake CAPTCHA and recovery secret lures to trick users into clicking malicious links. The document contains numerous links to external PDFs, many of which are likely part of a link farm designed to improve SEO for malicious content. The primary redirector URL, https://netcdn.online/app/406889139/oginject-co-game-hack, is flagged as malicious, indicating a high likelihood of further malicious activity or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 7

  • 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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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/oginject-co-game-hack In PDF document text
    • https://lib.btkljogja.or.id/repository/free-roblox-clothes-for-your-avatar_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/how-to-hack-into-peoples-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/hack-coin-master-8-ball-pool_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/hack-coin-master-apk-2021_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/free-robux-app-real_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/how-do-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/get-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/how-to-scam-on-roblox_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/coin-master-daily-free-spins-hack_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/rblx-gg-free-robux_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/coin-master-free-daily-spins-link_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/minecraft-free-unblocked_GM479516143.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/how-to-download-minecraft-for-free-on-android_GM479516143.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/free-coin-master-spins-daily_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/free-robux-exe_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/free-robux-site_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/coin-master-daily-free-spins-and-coins_GM406889139.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_off00004dcb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4DCB 25616 bytes
SHA-256: 5144f8e5b9e132081725319844235242c89c584e6549a4d9f9e1da3448b7c154
font_01_sfnt_off000088fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88FD 17796 bytes
SHA-256: edfc933cef9a2285abe675eee9fa95d4e262eddbac9f1810b55b91553a16c6ad

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