Malicious PDF — malware analysis report

Static analysis result for SHA-256 b682774a4fca0976…

MALICIOUS

PDF

45.2 KB Created: 2021-06-03 07:36:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: ddffe158b6d2e58c11d1cb28bc28c730 SHA-1: 3490db99673a84594ce182c4ef192cf3b113e9b3 SHA-256: b682774a4fca097652aa29d314b128ada591f08a2bbe5d94ef82c44a51176002
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one pointing to a 'game hack' lure, and is identified as a link farm. The ML classifier strongly indicates maliciousness. The embedded content, though obfuscated, contains URLs that are likely part of a phishing or scam campaign designed to redirect users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 4

  • 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.
  • 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/431946152/does-roblox-premium-expire-game-hack PDF link annotation
    • http://opac.library.uib.ac.id/repository/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://opac.library.uib.ac.id/repository/daily-free-spin-coin-master-link_GM406889139.pdfIn PDF document text
    • http://opac.library.uib.ac.id/repository/how-to-get-free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • http://opac.library.uib.ac.id/repository/easy-robux-today-com_GM431946152.pdfIn PDF document text
    • http://opac.library.uib.ac.id/repository/coin-master-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://opac.library.uib.ac.id//repository/coin-master-free-spins-link-download-today_GM406889139.pdfIn PDF document text
    • http://opac.library.uib.ac.id/repository/pubg-uc-carding-method-2021_GM1330123889.pdfIn PDF document text
    • http://opac.library.uib.ac.id//repository/how-to-hack-coin-master-without-root_GM406889139.pdfIn PDF document text
    • http://opac.library.uib.ac.id/repository/coin-master-free-spins-link-download-hack_GM406889139.pdfIn PDF document text
    • http://opac.library.uib.ac.id/repository/coin-master-link-daily-get-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://opac.library.uib.ac.id/repository/hack-game-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.library.uib.ac.id/repository/how-to-get-minecraft-for-free-on-xbox-one_GM479516143.pdfIn PDF document text
    • http://opac.library.uib.ac.id/repository/free-spins-and-coins-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://opac.library.uib.ac.id/repository/how-can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.library.uib.ac.id/repository/free-robux-no-verification-2021-android_GM431946152.pdfIn PDF document text
    • http://opac.library.uib.ac.id//repository/coin-master-400-spin-link-hack_GM406889139.pdfIn PDF document text
    • http://opac.library.uib.ac.id/repository/coin-master-free-spin-group_GM406889139.pdfIn PDF document text
    • http://opac.library.uib.ac.id//repository/roblox-free-vip-server_GM431946152.pdfIn PDF document text
    • http://opac.library.uib.ac.id//repository/how-to-get-free-spins-on-coin-master-without-waiting_GM406889139.pdfIn PDF document text
    • http://opac.library.uib.ac.id/repository/coin-master-free-codes_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_off00005315.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5315 26132 bytes
SHA-256: 78c113c2decbb2aa00048a8ef521bb401a2a5faa32085fe0aacf98b583cdfa3c
font_01_sfnt_off00008ce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CE2 18804 bytes
SHA-256: d678fd6a1bc8839950e26379efcb538c09795d0b2d64a023aa376d6a81e8ae9e

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