Malicious PDF — malware analysis report

Static analysis result for SHA-256 18873f5f6b049079…

MALICIOUS

PDF

35.1 KB Created: 2021-07-01 08:05:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: b747627f27f05d38e22de96fdb16e8f3 SHA-1: d38c6e4951d4b7b613139e9c666ad30a25d8fecb SHA-256: 18873f5f6b0490796a7d1897be36022c4ae58785e75fa1e62b16939083c4694c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to malicious redirectors, masquerading as "free generators" or "hacks" for popular games. The primary lure URL is http://netcdn.co/app/431946152/free-robux-hack-on-phone-no-download-game-hack, which is flagged as malicious infrastructure. The document body and embedded URLs reinforce this lure, aiming to trick users into visiting potentially harmful sites. No scripts were extracted, but the PDF's structure and embedded links strongly suggest a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/free-robux-hack-on-phone-no-download-game-hack In PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/roblox-jailbreak-hack-application-easy_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/free-roblox-clothes-girl_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/crazy-robux-hack_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/roblox-cbro-cheats_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/kron-hack-for-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/robux-websites-2021_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/free-robux-hack-generator-without-human-verification_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/how-to-hack-free-robux-2021-no-download_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/roblox-sword-free_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/coin-master-hack-root_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/synapse-hack-for-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/coin-master-hack-blogspot_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/free-codes-for-roblox-assassin_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/free-bandit-mask-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/roblox-free-vip-server_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/roblox-free-shirts-id_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/free-roblox-outfits-2021_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/robux-cheats-club_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/robux-fun-hack_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/coin-master-hack-online-without-human-verification_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_off00002ef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EF3 22836 bytes
SHA-256: 516e59f1df6049f475ea86295baa6a51996bc2f82c8e61a8dcc1faa4a6558b3d
font_01_sfnt_off00006231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6231 19784 bytes
SHA-256: 6fb1c5df51aacd0216ff4da56f32c76814892482f42211bf9d1054a6346adbcb

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