Malicious PDF — malware analysis report

Static analysis result for SHA-256 a38c6cbb43ea3542…

MALICIOUS

PDF

44.5 KB Created: 2021-06-04 03:06:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: fe1d17ce190783d0cef6d3feba4e54e0 SHA-1: 2efafc3accd89a8a4e2c5ba6990967b50e88366e SHA-256: a38c6cbb43ea354270200bab014f0080be4d42ea6de5288f82e9892f8518b6e6
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 0.9865

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/479516143/is-minecraft-free-on-xbox-game-hack PDF link annotation
    • http://library.umla.ac.id//repository/coin-master-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/how-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/how-to-make-a-minecraft-pe-server-for-free_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id/repository/how-to-get-free-coins-and-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-level-4_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/roblox-free-login_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/how-do-you-get-free-roblox_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/minecraft-apk-download-v1-144-2-free_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id/repository/mcpe-master-hack-unlimited-coins-download_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/easy-points-gg_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/how-do-i-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/roblox-com-www_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/cute-free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/cute-free-roblox-clothes_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/how-to-get-free-robux-on-computer_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/all-links-for-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-robux-kid-friendly-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-hack-cydia_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/online-coin-master-free-spin-app_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
stream_004_off000052c4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52C4 24604 bytes
SHA-256: c4a0ea1f3a464af1c362cda45bb86f1348191511ae1b28f321d177bdd52f7b50
font_01_sfnt_off00008b42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B42 18304 bytes
SHA-256: 19d9535fd2d352d2586ba99854d4ae80d513f2901e16ae506060a78b50b635a9

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