Malicious PDF — malware analysis report

Static analysis result for SHA-256 36f18879e38cf027…

MALICIOUS

PDF

37.0 KB Created: 2021-07-06 11:11:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 71bd6605e39292686d806cbd3c081158 SHA-1: 4a316af48066a1d5aee249163b22210a89b773e5 SHA-256: 36f18879e38cf027eff17dc515a308a64740fa592747a0358fa8c3be3d3ed6a2
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/431946152/free-robux-without-verification-2021-game-hack PDF link annotation
    • http://www.stttekstil.ac.id/elib/repository/can-you-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/free-roblox-hack-logiciel_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/how-to-get-free-robux-easy-no-hack_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/minecraft-fly-hack_GM479516143.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/coin-master-free-spins-link-31-march-2021_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/coin-master-new-cards-hack_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/how-to-get-free-robux-2021-no-verification_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/roblox-jailbreak-free-vip-server-2021_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/how-to-hack-to-get-a-girlfriend-in-roblox_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/roblox-gift-card-codes-for-free_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/how-to-hack-in-roblox-prison-life_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/coin-master-apk-hack-32_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/roblox-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/free-games-like-roblox_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/roblox-cheat-codes-for-robux-and-tix-2021_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/free-robux-web-store_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/how-to-get-free-robux-no-human-verivication_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/hack-coin-master-online-without-human-verification_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/wiek-ann-man-sich-robux-hacken_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/best-hacked-client_GM479516143.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_off000035ad.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x35AD 22960 bytes
SHA-256: 80b26a754eeaa72a5a73583ec3f5057a0083289524304b4c7eacbefd60ab2fd2
font_01_sfnt_off0000693a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x693A 19840 bytes
SHA-256: b77f23397a098c4dc3ad9c6ed3599495bca59c8db3ab458779c0241217e21131

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