Malicious PDF — malware analysis report

Static analysis result for SHA-256 81354f1b3409cf99…

MALICIOUS

PDF

33.8 KB Created: 2021-07-05 17:41:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: b4ad588512b1d18b25ea1c6d8f6e0d3b SHA-1: 8f32e1999adb0cfd2828f017baa9010ab56a2062 SHA-256: 81354f1b3409cf9981751a176fc01a9d40966735374e19453108c2c88c8157ec
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to a known malicious redirector infrastructure, specifically http://netcdn.tw/app/406889139/new-free-spins-coin-master-game-hack. The document body and embedded URLs suggest a lure for game hacks and free currency, which is a common social engineering tactic. The ML classifier also strongly indicated maliciousness.

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/406889139/new-free-spins-coin-master-game-hack In PDF document text
    • https://www.awmedicine.com/uploaded_files/userfiles/files/hack-all-guns-phantom-forces-roblox_GM431946152.pdfIn PDF document text
    • https://www.awmedicine.com/uploaded_files/userfiles/files/how-to-hack-in-survival-303-roblox_GM431946152.pdfIn PDF document text
    • https://www.awmedicine.com/uploaded_files/userfiles/files/roblox-hack-script-penis_GM431946152.pdfIn PDF document text
    • https://www.awmedicine.com/uploaded_files/userfiles/files/free-pet-treats-coin-master_GM406889139.pdfIn PDF document text
    • https://www.awmedicine.com/uploaded_files/userfiles/files/build-roblox-bloxburg-mansion-for-free_GM431946152.pdfIn PDF document text
    • https://www.awmedicine.com/uploaded_files/userfiles/files/free-coin-master-spins-hack_GM406889139.pdfIn PDF document text
    • https://www.awmedicine.com/uploaded_files/userfiles/files/jailbreak-app-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.awmedicine.com/uploaded_files/userfiles/files/increible-hack-de-robux_GM431946152.pdfIn PDF document text
    • https://www.awmedicine.com/uploaded_files/userfiles/files/how-to-get-free-minecoins-in-minecraft_GM479516143.pdfIn PDF document text
    • https://www.awmedicine.com/uploaded_files/userfiles/files/coin-master-free-spins-a2z-help_GM406889139.pdfIn PDF document text
    • https://www.awmedicine.com/uploaded_files/userfiles/files/roblox-god-hacks_GM431946152.pdfIn PDF document text
    • https://www.awmedicine.com/uploaded_files/userfiles/files/get-robux-com_GM431946152.pdfIn PDF document text
    • https://www.awmedicine.com/uploaded_files/userfiles/files/free-roblox-card_GM431946152.pdfIn PDF document text
    • https://www.awmedicine.com/uploaded_files/userfiles/files/roblox-free-robux-scam_GM431946152.pdfIn PDF document text
    • https://www.awmedicine.com/uploaded_files/userfiles/files/free-robux-pastebin_GM431946152.pdfIn PDF document text
    • https://www.awmedicine.com/uploaded_files/userfiles/files/coin-master-hack-tool-no-human-verification_GM406889139.pdfIn PDF document text
    • https://www.awmedicine.com/uploaded_files/userfiles/files/roblox-hacks-2021_GM431946152.pdfIn PDF document text
    • https://www.awmedicine.com/uploaded_files/userfiles/files/roblox-hack-site_GM431946152.pdfIn PDF document text
    • https://www.awmedicine.com/uploaded_files/userfiles/files/coin-master-daily-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://www.awmedicine.com/uploaded_files/userfiles/files/coin-master-free-food_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_off0000304f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x304F 22044 bytes
SHA-256: dd7d5710dbb1929d7b1a96f5fb0a4961067bfa69d7f7baa4dc847aad2c584f79
font_01_sfnt_off00006121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6121 18336 bytes
SHA-256: fecb999d4604ff46221f317ec0bf7c057532a4c956fcd599bb762c8e05d224c7

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