Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6c467641d2aac3e…

MALICIOUS

PDF

34.7 KB Created: 2021-07-04 23:55:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: f73bdf7f0f0e53cabd08d33e4f16fdff SHA-1: 0aadd2f4454743604588bfe42a745110cd5af829 SHA-256: f6c467641d2aac3e80cdb7fd19cf1c12de6c96aea653e8147b2e9d73cb92d60c
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/406889139/coin-master-hacks-iphone-game-hack PDF link annotation
    • http://digilib.akperkabpurworejo.ac.id/repository/new-dtfb-test-server-roblox-hack_GM431946152.pdfIn PDF document text
    • http://digilib.akperkabpurworejo.ac.id/repository/blogspot-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://digilib.akperkabpurworejo.ac.id//repository/coin-master-free-spins-2021-link_GM406889139.pdfIn PDF document text
    • http://digilib.akperkabpurworejo.ac.id/repository/pokemon-go-free-incense_GM1094591345.pdfIn PDF document text
    • http://digilib.akperkabpurworejo.ac.id/repository/codes-for-roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.akperkabpurworejo.ac.id/repository/diary-of-a-roblox-hacker_GM431946152.pdfIn PDF document text
    • http://digilib.akperkabpurworejo.ac.id/repository/how-to-get-minecraft-pe-for-free_GM479516143.pdfIn PDF document text
    • http://digilib.akperkabpurworejo.ac.id/repository/free-robux-no-human-verification-website_GM431946152.pdfIn PDF document text
    • http://digilib.akperkabpurworejo.ac.id/repository/free-robux-instant-inspect-element_GM431946152.pdfIn PDF document text
    • http://digilib.akperkabpurworejo.ac.id//repository/pubg-uc-gift-card_GM1330123889.pdfIn PDF document text
    • http://digilib.akperkabpurworejo.ac.id/repository/roblox-hacks-download-free-dll_GM431946152.pdfIn PDF document text
    • http://digilib.akperkabpurworejo.ac.id/repository/no-human-verification-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.akperkabpurworejo.ac.id/repository/backdoor-executor-roblox-free_GM431946152.pdfIn PDF document text
    • http://digilib.akperkabpurworejo.ac.id//repository/coin-master-cheat-codes-free_GM406889139.pdfIn PDF document text
    • http://digilib.akperkabpurworejo.ac.id/repository/twitter-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://digilib.akperkabpurworejo.ac.id/repository/free-robux-need-password_GM431946152.pdfIn PDF document text
    • http://digilib.akperkabpurworejo.ac.id/repository/roblox-hacks-and-cheats_GM431946152.pdfIn PDF document text
    • https://digilib.akperkabpurworejo.ac.id/repository/change-roblox-username-free-2021_GM431946152.pdfIn PDF document text
    • http://digilib.akperkabpurworejo.ac.id/repository/free-robux-safe_GM431946152.pdfIn PDF document text
    • http://digilib.akperkabpurworejo.ac.id/repository/how-to-get-1-million-robux-for-free-2021_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_off0000323a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x323A 22696 bytes
SHA-256: 1b7769d8cf4e94bdb4e30f61b5e3b8a825ba1f0ed1edcb662c6f4bacb7f07c47
font_01_sfnt_off000064f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64F6 18344 bytes
SHA-256: b25f1f54b32dc8a640253b18bc7ef351ac90ab75378d84f6bf8a3e5536491837

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