Malicious PDF — malware analysis report

Static analysis result for SHA-256 375b6f59daef1559…

MALICIOUS

PDF

34.5 KB Created: 2021-07-06 15:20:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 5cf8d7f7255d2465ddb4e5e6b5bb13ae SHA-1: 817a13709e4f20d867b1e57e386510e626e9bad3 SHA-256: 375b6f59daef1559d9a0f997daf3cc520b06e21626d21d6a5dcfab8f704404bb
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.tw/app/431946152/robloxheroxyz-free-robux-game-hack PDF link annotation
    • https://elibrary.sttar.ac.id/repository/using-cheat-engine-on-roblox-bluestacks_GM431946152.pdfIn PDF document text
    • https://elibrary.sttar.ac.id/repository/coin-master-free-spin-link-list_GM406889139.pdfIn PDF document text
    • https://elibrary.sttar.ac.id/repository/free-coin-master-coins_GM406889139.pdfIn PDF document text
    • https://elibrary.sttar.ac.id/repository/how-to-generate-pubg-uc_GM1330123889.pdfIn PDF document text
    • https://elibrary.sttar.ac.id/repository/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • https://elibrary.sttar.ac.id/repository/hack-in-roblox-to-unlock-elemental-dragon_GM431946152.pdfIn PDF document text
    • https://elibrary.sttar.ac.id/repository/hack-coin-master-android-game_GM406889139.pdfIn PDF document text
    • https://elibrary.sttar.ac.id/repository/how-to-duplicate-coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • https://elibrary.sttar.ac.id/repository/coin-master-free-cards-link_GM406889139.pdfIn PDF document text
    • https://elibrary.sttar.ac.id/repository/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • https://elibrary.sttar.ac.id/repository/hack-into-someones-roblox-account_GM431946152.pdfIn PDF document text
    • https://elibrary.sttar.ac.id/repository/coin-master-tiradas-gratis_GM406889139.pdfIn PDF document text
    • https://elibrary.sttar.ac.id/repository/free-robux-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://elibrary.sttar.ac.id/repository/rewardrobux-com_GM431946152.pdfIn PDF document text
    • https://elibrary.sttar.ac.id/repository/tower-of-hell-roblox-hack_GM431946152.pdfIn PDF document text
    • https://elibrary.sttar.ac.id/repository/free-2021-robux_GM431946152.pdfIn PDF document text
    • https://elibrary.sttar.ac.id/repository/how-to-cheat-in-roblox_GM431946152.pdfIn PDF document text
    • https://elibrary.sttar.ac.id/repository/blogspot-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://elibrary.sttar.ac.id/repository/minecraft-free-apk-download-016-0_GM479516143.pdfIn PDF document text
    • https://elibrary.sttar.ac.id/repository/free-roblox-cracked-exploit_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_off00003030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3030 22156 bytes
SHA-256: a0cf6e84b6fd8aa13df851e06d0f7360e410191d34ed27d083bd300a646dd2a3
font_01_sfnt_off00006173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6173 19220 bytes
SHA-256: 9a75403dc61fcebb8363624a6f582dcc4ac1fd2d4c1d167fae2ecfa95e24b96b

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