Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5bd77d097fd746e…

MALICIOUS

PDF

32.6 KB Created: 2021-07-06 05:42:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 9ca1fac46e265df7dc625ae8eed4d5d3 SHA-1: 5b4082eebe782a34000e23c19da1fe62f99451ec SHA-256: d5bd77d097fd746e3411961eb94a339e1cb145d51784888a460712e498566e80
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one pointing to a known malicious redirector infrastructure at 'http://netcdn.tw/app/431946152/mathep-game-hack'. This redirector is associated with lures for game hacks and generators, suggesting a phishing or scam campaign. The presence of a large number of external PDF links further indicates a link farm designed to attract traffic.

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.
  • 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.
  • 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.tw/app/431946152/mathep-game-hack In PDF document text
    • https://fib.ub.ac.id/sac//repository/free-unlimited-coin-master-online-tool_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-robux-no-survey-no-download-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-robux-no-human-verification-no-inspect-no-password_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-spins-for-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-army-gfx-roblox_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/best-free-minecraft-server-hosting-reddit_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/moonactive-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-minecraft-capes_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/hacking-my-brothers-roblox-acaawaant_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/coin-master-hack-without-human-verification_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/coin-master-daily-spin-free_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/minecraft-free-ios-2021_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-roblox-gift-ard-codes-valid-codes_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/minecraft-114-4-download-free_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-dragon-ball-rage-hack-stats_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-make-a-free-minecraft-account_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/free-24-7-minecraft-server_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/cm-spin-link_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_off00002c3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C3E 21648 bytes
SHA-256: c54523738cb1958379f1a9c23b4693014ad7dc3f2f32fb27e39ae13943f3240c
font_01_sfnt_off00005be5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BE5 18544 bytes
SHA-256: 49092de834d3f8fc0161edca5c8ffc9035116622ffbf8cd5420aeadd749a8349

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