Malicious PDF — malware analysis report

Static analysis result for SHA-256 da41b8f7e27dbff1…

MALICIOUS

PDF

34.5 KB Created: 2021-07-04 09:15:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 4d487b42a3de0ca992eb6370ccd63b38 SHA-1: 4f739a7af31bb3d0885af0e32f694a05fcbbeb99 SHA-256: da41b8f7e27dbff1529b7fc7eab16cbe0ad4e053eb7e94a3d8c7c21a5278716e
160 Risk Score

Malware Insights

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

This PDF document employs a lure related to game hacks and free in-game currency to entice users. It contains links to known malicious redirectors and other PDF files hosted on potentially compromised domains. The presence of a download button lure further supports the malicious intent of directing users to external, untrusted resources. No scripts were extracted, but the document's structure and embedded URLs indicate a phishing or redirection scheme.

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/roblox-prison-life-hack-game-hack In PDF document text
    • http://chem.ipb.ac.id/kim/repository/roblox-trolling-outfit-for-free_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/roblox-hack-clients-2021-aimbot-island-royale_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/coin-master-daily-gift-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/roblox-free-tbc_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/coin-master-daily-free-spins-link_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/coin-master-today_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/coin-master-hackcom-xyz_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/free-ways-to-get-robux_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/best-free-rp-games-on-roblox_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/hack-coin-master-spin_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/coin-master-hack-unlimited-spins-and-coins-cheats_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/ww-robux_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/roblox-free-dresses_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/roblox-vehicle-speed-hack-script_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/free-100-robux_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/minecraft-java-free-trial_GM479516143.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/gold-card-coin-master-free_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_off0000305d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x305D 22412 bytes
SHA-256: c805bf13f5e7ef268e3e9e1512319344585a663e66624f0caa4246bf0b8abca9
font_01_sfnt_off0000625b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x625B 18932 bytes
SHA-256: 757c592a10e4627f90624bfdd8f1127ea4c0f8f917493ad00ff1bc4f9e7f3eb7

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