Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d4387f59b36be20…

MALICIOUS

PDF

34.7 KB Created: 2021-07-04 23:25:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 3e676c0241860d1ba4fa516a032a5cd0 SHA-1: d9ced9b100b1df60bf12a6a05aa693edf33d8d3c SHA-256: 1d4387f59b36be202a47f116cc9ce6a9baff591c29e9135e67702305a7edcff4
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links designed to lure users into clicking on them, promising free in-game currency or hacks. The primary link, http://netcdn.tw/app/431946152/claim-robux-game-hack, is a known redirector. The heuristic firings indicate a link farm and a game hack lure, suggesting the document's purpose is to drive traffic to potentially malicious sites. No scripts were extracted, but the document structure and embedded URLs strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 5

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/claim-robux-game-hack PDF link annotation
    • http://perpus.fisip.unnur.ac.id/repository/how-to-get-free-robux-pins_GM431946152.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/how-to-hack-roblox-highschool-money_GM431946152.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/legit-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/who-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/minecraft-pocket-edition-free-ios_GM479516143.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/best-free-robwhat-does-roblox-points-do-ox-clothes_GM431946152.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/roblox-robux-generator-no-hack_GM431946152.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/roblox-free-dress_GM431946152.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/hacker-told-me-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/roblox-ultimate-boxing-hack_GM431946152.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/free-robux-for-roblox-cheats-and-guide-download-hack_GM431946152.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/free-robux-live-stream-giveaway-right-now_GM431946152.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/minecraft-mods-download-free_GM479516143.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/coin-master-free-spin-realme-products_GM406889139.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/free-spins-on-coin-master-cheat_GM406889139.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/how-to-get-free-stuff-on-roblox-catalog-on-ipad_GM431946152.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/tango-hack-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/how-to-get-free-skins-in-minecraft_GM479516143.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/coin-master-free-spins-and-coins-blogspot_GM406889139.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/coin-master-cheats-for-free-spins_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3459 21332 bytes
SHA-256: 56ac9f625fffd8abfc565cc35313d3477267ffe0356cfff66d6067b009ff487c
font_01_sfnt_off000062df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62DF 19008 bytes
SHA-256: 2d699b59fae2859d2e8e824a2ab2ebb8118e4eb1d61ccb84239df2816aec8c92

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