Malicious PDF — malware analysis report

Static analysis result for SHA-256 43a0b6aab0539429…

MALICIOUS

PDF

32.5 KB Created: 2021-07-16 06:37:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: c7de5a011d86abf2ff25f78cae78c49e SHA-1: 7960faa3761062f86c7ead64f1612d639c6e08a9 SHA-256: 43a0b6aab05394293e75c83d8c583ee8cfbc799adf92074060fa46da57d0494a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to malicious infrastructure, specifically promoting 'free Robux' generators and game hacks. The document body and heuristics confirm the lure is for game-related cheats, likely to lead users to a phishing or malware download site. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

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.tw/app/431946152/roblox-com-free-robux-game-hack In PDF document text
    • https://www.ombalicargo.com/new/public/ckfinder/userfiles/files/coin-master-spins-gratis_GM406889139.pdfIn PDF document text
    • https://www.ombalicargo.com/new/public/ckfinder/userfiles/files/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://www.ombalicargo.com/new/public/ckfinder/userfiles/files/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.ombalicargo.com/new/public/ckfinder/userfiles/files/pastebin-free-robux-no-waiting_GM431946152.pdfIn PDF document text
    • https://ombalicargo.com/new/public/ckfinder/userfiles/files/coin-and-spin_GM406889139.pdfIn PDF document text
    • https://www.ombalicargo.com/new/public/ckfinder/userfiles/files/how-to-get-infinite-robux_GM431946152.pdfIn PDF document text
    • https://ombalicargo.com/new/public/ckfinder/userfiles/files/coin-master-free-redeem-code_GM406889139.pdfIn PDF document text
    • https://ombalicargo.com/new/public/ckfinder/userfiles/files/free-modded-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • https://www.ombalicargo.com/new/public/ckfinder/userfiles/files/how-to-hack-someone-on-roblox-on-a-phone_GM431946152.pdfIn PDF document text
    • https://ombalicargo.com/new/public/ckfinder/userfiles/files/how-to-get-free-robux-no-copy-and-paste_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_off000029b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29B0 22660 bytes
SHA-256: 1e58ada4aecac14dca5717ef3e5f957b3ec454e2c8d3122f3791096b0ed0f476
font_01_sfnt_off00005c35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C35 18536 bytes
SHA-256: 8bd8f79a3d85335837704a41a1f8010889ce781331cd4cec55e8058680d5a9b8

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