Malicious PDF — malware analysis report

Static analysis result for SHA-256 33783047293ea129…

MALICIOUS

PDF

34.7 KB Created: 2021-07-05 10:59:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 4783750bf3a09048ad33ce4550de6b22 SHA-1: 5557cfebc4cffbb5f671b2d79f471621d8b6d9bc SHA-256: 33783047293ea1291c7a01e9779689a8b6085f0fa7d0cd33d19c55f605fc48a6
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links designed to lure users to external sites, including a known malicious redirector at http://netcdn.tw/app/406889139/coin-master-free-attack-hack-game-hack. The document body and heuristics indicate a focus on 'game hacks' and 'free spins', suggesting a scam or phishing attempt. The presence of embedded URLs and the PDF structure strongly suggest this document is intended as a malicious lure, likely delivered as a spearphishing attachment.

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/406889139/coin-master-free-attack-hack-game-hack In PDF document text
    • http://opac.kolejkrim.edu.my/repository/get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/how-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/how-to-have-free-robux-in-a-web_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/coin-master-pro-hack_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/coin-master-game-hack-online_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/how-to-get-free-coins-in-assassin-roblox-2021_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/cool-aoutfits-for-free-in-roblox_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-robux-com-roblox_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/easiest-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-robux-cheap_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/how-to-get-free-items-on-roblox_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/coin-master-free-spins-daily-fb-champion_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/claimrobux-net_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/how-to-get-free-clothes-and-hair-on-roblox_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-roblox-girl-hair-not-a-model_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/btools-roblox-hack-jailbreak_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/cheat-engine-roblox-lumber-tycoon-2-money_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-robux-codes-on-android-2021-no-human-verification_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
stream_002_off00003370.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3370 22388 bytes
SHA-256: 590e9e037233e43d8abb622aecef4b24a65acd18bf9cd82d61380703b11684fa
font_01_sfnt_off0000654d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x654D 18168 bytes
SHA-256: 77f95f04567bf1dae2980aee4eb06266131c8f3c94fbaa988a5df0c5268c5636

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