Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e15f4bb61a21697…

MALICIOUS

PDF

33.3 KB Created: 2021-07-05 19:33:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: aa9a202a05529333becc9b67592d3564 SHA-1: d045dd964726884853f7b195c0fc59f43f41eecd SHA-256: 4e15f4bb61a21697701b4f6d6d938700b4df33befd25541ce83a3a0ed508db7a
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-online-hack-link-game-hack PDF link annotation
    • http://library.apsidoarjo.ac.id/repository/coin-master-free-stuff-links_GM406889139.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/how-to-get-unlimeted-robux-for-free-with-copying-notes_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/games-like-minecraft-but-free_GM479516143.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/how-to-get-free-robux-easy-no-download_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/how-to-get-free-spins-on-coin-master-facebook_GM406889139.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/show-me-how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id//repository/roblox-studio-free-robux_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/how-to-download-minecraft-for-free-on-your-phone_GM479516143.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/roblox-strucid-aimbot-hack_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/completely-black-pants-roblox-free_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/free-robux-teleplate_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/free-robux-giver-no-survey_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/robux-hack-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/is-there-a-way-to-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/coin-master-hack-lost-world-2021_GM406889139.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/free-robux-com-generator_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/robux-hack-download-2021_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/roblox-admin-hack-jailbreak_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/coin-master-500-free-spins_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_002_off00002dda.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2DDA 22476 bytes
SHA-256: e60afcbe8e41bacb3a230e7cfc0450eb1c37b4faaa0e9bce14b3562ddfb64d9c
font_01_sfnt_off00005fe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FE2 18080 bytes
SHA-256: fae27d4c4c2e952e6b547115e62f69cc1ea43df316298c73a3448a7f0ad6854c

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