Malicious PDF — malware analysis report

Static analysis result for SHA-256 c13f9ea25d928db9…

MALICIOUS

PDF

34.0 KB Created: 2021-07-05 18:01:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 6e824fcd45475f5ab171ff95e2d11bf3 SHA-1: 5d2d2ba9f3c95d0f21c05c3ef0c773dc7b3a6461 SHA-256: c13f9ea25d928db91e109f6335fdd61f424a874e52f36f0d131d56149008b5b4
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one to a known malicious redirector infrastructure, masquerading as a 'free generator / game hack'. The document body reinforces this lure by mentioning 'Free Roblox Games Scripts'. This suggests the primary goal is to redirect users to potentially malicious websites, likely for credential harvesting or further malware delivery.

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.tw/app/431946152/free-roblox-games-scripts-game-hack In PDF document text
    • http://digilib.stimlog.ac.id/repository/free-robux-earn_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/minecraft-for-macbook-free_GM479516143.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/bleu-roblox-mega-free_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/script-executor-roblox-free-download_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-cheats-how-to-get-free-stuff_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/piano-player-hack-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-comment-avoir-le-shirt-swat-free_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/minecraft-hack-app_GM479516143.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-cheat-codes-pc_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-adidas-t-shirt-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/cheat-engine-64-speed-hack-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-robux-copypasta_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/leafy-roblox-cheat_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/are-free-robux-sites-legit_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/rise-of-nations-cheats-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/app-para-hackear-cuentas-de-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/rbx-place-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/hack-roblox-jailbreak-774_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-hack-almost-any-game-roblox_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_off00002e37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E37 22056 bytes
SHA-256: 66a3eccfff9bba8e1b21b421099dff1eff93611b4afb0a1a335e4d46949bbb18
font_01_sfnt_off00005f30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F30 19312 bytes
SHA-256: 88a6a79bd2fedfa8521d1514ab98e12f2e263fc1e16bf29622114fdbb03e7696

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