Malicious PDF — malware analysis report

Static analysis result for SHA-256 87e4e6c02b7d615c…

MALICIOUS

PDF

45.9 KB Created: 2021-06-04 02:37:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 2a465b4c00b3358f7a78b7cffbc55794 SHA-1: 1567b681581c5fc630df0d95531922c2f3c716b2 SHA-256: 87e4e6c02b7d615c8241277e0bf3c1b090589f9eeeb65b37516ffb1a714b0350
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 0.9797

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 https://netcdn.online/app/406889139/get-free-lives-on-coin-master-game-hack PDF link annotation
    • https://library.uigm.ac.id/repository/how-to-cheat-in-roblox_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/free-links-for-free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/free-robux-stream_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/coin-master-free-spins-cheat_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/free-roblox-clothes-and-hair_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/free-roblox-gift-card-codes_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/how-to-hack-m-coins-mcpe-master_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/best-tricks-co-robux_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/free-minecraft-skins-pe_GM479516143.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/is-minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/give-me-robux-now_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/free-minecraft-servers-to-join_GM479516143.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/rbx-place-free-robux_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/tiktok-free-code_GM835599320.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/coin-master-heaven-links-free-spins_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/how-to-hack-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/play-full-version-of-minecraft-for-free-no-download_GM479516143.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/60-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/spin-coin-master_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004e70.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E70 25048 bytes
SHA-256: c0b2b4edfbca51c836db74985f215f68ad9750596b62f4570d6edd9291169683
font_01_sfnt_off000087a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87A4 2928 bytes
SHA-256: 9f9429556154f58f51965d4607d75d12cc88cffeb51594c11f518038b5c3e096
font_02_sfnt_off000091c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91C0 17824 bytes
SHA-256: 98e8fff89c022a83b4f395b71729b3265c44f0a4288b6eee3ecf04cc1aa00118

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