Malicious PDF — malware analysis report

Static analysis result for SHA-256 80bd41680f7421dc…

MALICIOUS

PDF

54.1 KB Created: 2021-06-11 05:13:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: db823ee82829571266c87e7db74dbdd5 SHA-1: 8407c4151dc1bcbde4a325190e3d4e1b04f6fa37 SHA-256: 80bd41680f7421dc0b862084ffbc2829bc9f0ee2a4d409613b2131f8f90534c1
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 0.9491

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.tw/app/431946152/roblox-cheat-engine-hacks-december-2021-game-hack PDF link annotation
    • http://lib.uho.ac.id/library//repository/coin-master-code-hack_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/how-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-400-spin-link-hack_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-hack-deutsch-auf-pc_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-spins-coin-master-app-iphone_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/minecraft-free-download-ipad_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/minecraft-java-edition-key-free_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/unlimited-robux-2021_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-rewards_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/gift-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-can-you-get-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-tiktok-followers-quick-and-easy_GM835599320.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-do-you-earn-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-start-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-free-400-spin-link_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/hack-my-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-daily-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-get-a-free-private-roblox_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-free-spins-link-blogspot-2021_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000052fc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52FC 28024 bytes
SHA-256: ae217651dce90846efe130e2bc231e844e5149b38f896f34abe315bec62d54c1
font_01_sfnt_off000093fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93FD 3500 bytes
SHA-256: e49a868379cd3c37e631c5a53c010e21f38d803532a2b8417aee82315d4e8634
font_02_sfnt_off00009f9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9F9A 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_03_sfnt_off0000acac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACAC 19688 bytes
SHA-256: 3fde567ebe8811d4fe3aef81bbceba7ed8778d180bf8d4eca287138953c231b2

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