Malicious PDF — malware analysis report

Static analysis result for SHA-256 87c1da3b65a59c55…

MALICIOUS

PDF

44.3 KB Created: 2021-05-16 04:41:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: d686fb8e753293fecbeaca88bfb1cd6d SHA-1: 7037a7cd3ecf0e71bb857e6215954e0f1879d776 SHA-256: 87c1da3b65a59c5595d0c3c1303b0e7cd6accdb2cffc16b4cb823792bc057deb
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to known malicious infrastructure, specifically advertising 'game hacks' and 'free currency'. The ML classifier also flagged this PDF as malicious. The primary attack pattern involves luring users to click these links, likely leading to further malware downloads or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9648

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 https://netcdn.xyz/app/406889139/coin-master-free-coins-link-facebook-game-hack In PDF document text
    • http://gameanglinginstructors.co.uk/images/free-roebucks-no-human-verification_GM431946152.pdfIn PDF document text
    • http://gameanglinginstructors.co.uk/images/coin-master-hack-apk-33-download_GM406889139.pdfIn PDF document text
    • http://gameanglinginstructors.co.uk/images/free-spins-coin-master-links-2021_GM406889139.pdfIn PDF document text
    • http://gameanglinginstructors.co.uk/images/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • http://gameanglinginstructors.co.uk/images/tryrbx-site-free-robux_GM431946152.pdfIn PDF document text
    • http://gameanglinginstructors.co.uk/images/free-robux-without-offers_GM431946152.pdfIn PDF document text
    • http://gameanglinginstructors.co.uk/images/tiktok-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://gameanglinginstructors.co.uk/images/get-free-minecraft-account_GM479516143.pdfIn PDF document text
    • http://gameanglinginstructors.co.uk/images/roblox-bux-free_GM431946152.pdfIn PDF document text
    • http://gameanglinginstructors.co.uk/images/how-to-download-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://gameanglinginstructors.co.uk/images/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://gameanglinginstructors.co.uk/images/coin-master-hack-no-verification-ios_GM406889139.pdfIn PDF document text
    • http://gameanglinginstructors.co.uk/images/free-robux-pins_GM431946152.pdfIn PDF document text
    • http://gameanglinginstructors.co.uk/images/coin-master-free-spins-facebook_GM406889139.pdfIn PDF document text
    • http://gameanglinginstructors.co.uk/images/how-to-get-free-spins-in-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://gameanglinginstructors.co.uk/images/free-robux-groups-2021_GM431946152.pdfIn PDF document text
    • http://gameanglinginstructors.co.uk/images/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • http://gameanglinginstructors.co.uk/images/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdfIn PDF document text
    • http://gameanglinginstructors.co.uk/images/how-to-get-free-robux-website_GM431946152.pdfIn PDF document text
    • http://gameanglinginstructors.co.uk/images/minecraft-java-code-free_GM479516143.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_003_off000048e2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48E2 25392 bytes
SHA-256: 61b16704b73f0405419c088a2b3878891e487499de425100ca10f271c146d8a1
font_01_sfnt_off000081ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81AB 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00008b5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B5D 18040 bytes
SHA-256: 63f6a73c8fcac7a0296ba30c45c7d116406f1db46acc5b5307ffbf1c764f0ccd

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