Malicious PDF — malware analysis report

Static analysis result for SHA-256 af5421fe69b8e18c…

MALICIOUS

PDF

35.3 KB Created: 2021-06-25 02:19:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 59eaf54c830f91b0f7f7e1b0c20ae88a SHA-1: db16d164dc9a40630b02eeb5bc93f0e40221c628 SHA-256: af5421fe69b8e18c06f63df3ea8ef036608e9bd5d40b2f0dab5293073739824a
180 Risk Score

Malware Insights

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

This PDF document contains a malformed exploit stream and links to known malicious redirector infrastructure. The document body and embedded URLs promote 'free Robux' and game hacks, indicating a lure for users to click malicious links. The primary link, http://netcdn.co/app/431946152/free-robux-promo-codes-2021-not-expired-game-hack, is identified as a malicious redirector, likely leading to further malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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 http://netcdn.co/app/431946152/free-robux-promo-codes-2021-not-expired-game-hack In PDF document text
    • http://library.itekes-bali.ac.id/repository/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/roblox-cheat-robux_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/minecraft-hack-2021_GM479516143.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-robux-scams_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/minecraft-hacks-list_GM479516143.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/minecraft-free-unblocked_GM479516143.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-generator_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/roblox-free-clothes-generator_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/roblox-rc7-cracked-free-download_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/hack-a-game_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/roblox-headphones-free_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/fly-hack-roblox-script-2021_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/14-de-diciembre-roblox-hacker_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/boku-no-roblox-remastered-op-gui-script-hack_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/microsoft-bing-free-robux_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-robux-no-email_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/get-free-spins-on-coin-master_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
font_00_sfnt_off00003047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3047 22164 bytes
SHA-256: c3735ecc221680e3d893e2f6639074710e077de6b6775f6ee00d264de98e295b
font_01_sfnt_off00006196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6196 20104 bytes
SHA-256: 6ac147a91636aa254d53d7af70f448725046b6bfb365639fdfbdfbe2cbb958d3

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