Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bcdde0b50369275…

MALICIOUS

PDF

44.7 KB Created: 2021-05-11 12:43:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 8b032980f1e7b2dc728f5a5a46a14afb SHA-1: aeab8b6d6d2724b27079ba83e5908d5f926227a4 SHA-256: 4bcdde0b50369275b3ba4a401b144f9584a76580736f11aa1a82c413855b9311
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, disguised as "game hacks" and "free spins" lures. The document body and embedded URLs strongly suggest a phishing attempt to redirect users to potentially malicious sites. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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/earn-free-spins-in-coin-master-game-hack In PDF document text
    • http://d-cision.nl/images/games-that-can-be-hacked_GM431946152.pdfIn PDF document text
    • http://d-cision.nl/images/how-to-hack-roblox_GM431946152.pdfIn PDF document text
    • http://d-cision.nl/images/free-coin-master-androd-cheats-2021_GM406889139.pdfIn PDF document text
    • http://d-cision.nl/images/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://d-cision.nl/images/free-vpn-for-minecraft_GM479516143.pdfIn PDF document text
    • http://d-cision.nl/images/coin-master-mod-apk-latest-hack-with-unlimited-free-spins_GM406889139.pdfIn PDF document text
    • http://d-cision.nl/images/rbxfree-com-free-robux_GM431946152.pdfIn PDF document text
    • http://d-cision.nl/images/roblox-old-avatar_GM431946152.pdfIn PDF document text
    • http://d-cision.nl/images/master-coin-free-spin-daily_GM406889139.pdfIn PDF document text
    • http://d-cision.nl/images/websites-for-robux_GM431946152.pdfIn PDF document text
    • http://d-cision.nl/images/free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://d-cision.nl/images/coin-master-free-spins-11-01-2021_GM406889139.pdfIn PDF document text
    • http://d-cision.nl/images/minecraft-esp_GM479516143.pdfIn PDF document text
    • http://d-cision.nl/images/how-do-you-earn-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://d-cision.nl/images/free-robux-legit_GM431946152.pdfIn PDF document text
    • http://d-cision.nl/images/roblox-robux-hack_GM431946152.pdfIn PDF document text
    • http://d-cision.nl/images/rewardex-robux_GM431946152.pdfIn PDF document text
    • http://d-cision.nl/images/robux-sign_GM431946152.pdfIn PDF document text
    • http://d-cision.nl/images/cheat-codes-for-coin-master_GM406889139.pdfIn PDF document text
    • http://d-cision.nl/images/coinmaster-spin-ml-free_GM406889139.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_off00004769.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4769 25636 bytes
SHA-256: e734d290066ae5b9b8ecefa0438fcd81b1c39c4a1bfaa9d3b6591cb943cf32f2
font_01_sfnt_off0000820d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x820D 3400 bytes
SHA-256: 4b3e0f36ad1e0c7e3ea5c178fd2b4f097d1e01575fc6a4101a8b520db34dfe07
font_02_sfnt_off00008d37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D37 17884 bytes
SHA-256: c27ada76ada0ec2a2d4f0dfd6bc904cd28eddfde4ea8d230e478e22202e815c5

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