Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6a103ccbf7079c4…

MALICIOUS

PDF

35.4 KB Created: 2021-06-28 16:49:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b1416d40c599a01181afcae5214e017f SHA-1: aaf77f5fd9165890f5d00332b74ba9e026529e0a SHA-256: f6a103ccbf7079c49e97d58663fce176150b0c30d2190c57bf92874ad7009482
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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.co/app/431946152/how-to-get-shirts-on-roblox-for-free-game-hack PDF link annotation
    • https://www.mescosa.com/uploaded_files/userfiles/files/coin-master-3rd-village-free-2021-gift-card_GM406889139.pdfIn PDF document text
    • https://www.mescosa.com/uploaded_files/userfiles/files/feb-23-2021-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://www.mescosa.com/uploaded_files/userfiles/files/roblox-holy-sword-cheats_GM431946152.pdfIn PDF document text
    • https://www.mescosa.com/uploaded_files/userfiles/files/minecraft-client-download_GM479516143.pdfIn PDF document text
    • https://www.mescosa.com/uploaded_files/userfiles/files/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • https://www.mescosa.com/uploaded_files/userfiles/files/free-op-minecraft-servers_GM479516143.pdfIn PDF document text
    • https://www.mescosa.com/uploaded_files/userfiles/files/free-robux-without-checking-if-you-are-a-robot_GM431946152.pdfIn PDF document text
    • https://www.mescosa.com/uploaded_files/userfiles/files/codes-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.mescosa.com/uploaded_files/userfiles/files/coin-master-hack-2021-apk_GM406889139.pdfIn PDF document text
    • https://www.mescosa.com/uploaded_files/userfiles/files/free-likes-for-tiktok_GM835599320.pdfIn PDF document text
    • https://www.mescosa.com/uploaded_files/userfiles/files/hey-google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.mescosa.com/uploaded_files/userfiles/files/roblox-sprinting-simulator-2-hack-script_GM431946152.pdfIn PDF document text
    • https://www.mescosa.com/uploaded_files/userfiles/files/coin-master-free-spins-moonactive_GM406889139.pdfIn PDF document text
    • https://www.mescosa.com/uploaded_files/userfiles/files/free-ways-to-get-robux_GM431946152.pdfIn PDF document text
    • https://www.mescosa.com/uploaded_files/userfiles/files/hack-roblox-rose_GM431946152.pdfIn PDF document text
    • https://www.mescosa.com/uploaded_files/userfiles/files/how-to-get-free-shirts-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.mescosa.com/uploaded_files/userfiles/files/get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://www.mescosa.com/uploaded_files/userfiles/files/how-to-get-free-money-roblox-vehicle-simulator_GM431946152.pdfIn PDF document text
    • https://www.mescosa.com/uploaded_files/userfiles/files/coin-master-free-coins-and-spins-hack_GM406889139.pdfIn PDF document text
    • https://www.mescosa.com/uploaded_files/userfiles/files/free-spins-coin-master-hack-2021_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_off000032fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32FB 22464 bytes
SHA-256: d847fa40eeabd0f2da77bba7f7668c01a3bdb3dd75c58cdef210b4132ffbccb1
font_01_sfnt_off000064f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64F8 19204 bytes
SHA-256: 4ca969ebd77b9fbb3d704324967739ed9ec5bcaeb37dbd11de2315b4aac92d8a

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