Malicious PDF — malware analysis report

Static analysis result for SHA-256 1de3951d3938392f…

MALICIOUS

PDF

36.2 KB Created: 2021-06-28 00:41:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: d2994dbccafcfcd6a2a578ea2994bede SHA-1: bb2fce0675403d86b889fb81cae3d4233f565e12 SHA-256: 1de3951d3938392f1031a3c6e95ecb0a2a660a9324790d6a014585b80b0ca87e
220 Risk Score

Malware Insights

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

This PDF document is designed as a lure, presenting itself as a generator for in-game currency like Robux. It contains numerous links to malicious redirectors and SEO link farms, aiming to drive traffic to potentially harmful sites. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to exploit user interest in free game items.

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.co/app/431946152/roblox-hack-robux-2021-no-download-game-hack In PDF document text
    • http://library.itekes-bali.ac.id/repository/rblx-city-free-robux_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/coin-master-free-coins-and-spins-2021_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-coin-master-gifts_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/server-for-pubg-uc_GM1330123889.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/roblox-robux-pastebin-hack-2021_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/how-can-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-robux-no-survey-or-human-verification_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-robux-only-1-step_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/how-to-get-free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/how-to-get-free-chest-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/roblox-galaxy-arcade-ressourcen-cheats_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/www-roblox-com-robux-free_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/how-to-get-25-000-robux-for-free_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/como-sacar-buen-puntaje-en-juego-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/roblox-booga-booga-cheat-engine-how-to-get-unlimited-essence_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-ways-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-robux-hack-no-human-verification-at-all-for-kids_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.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_off000032cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32CF 23000 bytes
SHA-256: 1c9eead135446cf472980d68f27e32771dde6056bc63f176ef4c4249b5b1707b
font_01_sfnt_off00006669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6669 19704 bytes
SHA-256: 75fdb5d742c6a13feecfd8cd6fb58ee91e4626bc93d986f8840dd6b9b79bd56c

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