Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a78c15345f6352a…

MALICIOUS

PDF

34.7 KB Created: 2021-07-05 10:34:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-02
MD5: ed182d5a7f98381799b7611fc8171f9b SHA-1: 1f8f2c4d3c2ee3f6fe4864b45084660252dbd79a SHA-256: 3a78c15345f6352a9d0a7ab2dcf05121bc95a3b25becf6073dd1d029c5c6738f
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/free-coin-master-coins-game-hack PDF link annotation
    • http://elibraryfk.unjani.ac.id/elibrary/repository/how-to-hack-fly-on-skyward-roblox_GM431946152.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/elibrary/repository/roblox-black-panther-shirt-free_GM431946152.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/elibrary/repository/roblox-twisted-murderer-free-credits-givaway_GM431946152.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/elibrary/repository/money-hack-roblox-adopt-me_GM431946152.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/elibrary/repository/worst-client_GM479516143.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/fkrepository/repository/how-to-play-paid-games-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/elibrary/repository/alt-delete-item-roblox-hack_GM431946152.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/fkrepository/repository/card-hack-in-coin-master_GM406889139.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/fkrepository/repository/free-roblox-toy-redemption-codes_GM431946152.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/elibrary/repository/how-do-you-get-free-roblox_GM431946152.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/elibrary/repository/coin-master-hack-here_GM406889139.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/elibrary/repository/robux-hack-no-download-apps_GM431946152.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/elibrary/repository/free-codes-for-promo-roblox-2021_GM431946152.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/fkrepository/repository/roblox-lumber-tycoon-2-hack-windows-6_GM431946152.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/fkrepository/repository/mcpe-download_GM479516143.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/elibrary/repository/how-to-get-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/fkrepository/repository/hack-that-thing-roblox_GM431946152.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/elibrary/repository/roblox-piano-hack-script_GM431946152.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/elibrary/repository/how-do-i-hack-roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/fkrepository/repository/free-spins-on-coin-master-2021-ios_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000324a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x324A 22976 bytes
SHA-256: 62d737f8dd354ca26cff5a123b1fd144801a20df898046840663c032e450c6eb
font_01_sfnt_off000065aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65AA 17996 bytes
SHA-256: e3fb1ca426c01543f38f1d1129ae452bef28a40365fbe99abf1b239340e30419

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