Malicious PDF — malware analysis report

Static analysis result for SHA-256 d52e1379094d1c84…

MALICIOUS

PDF

47.7 KB Created: 2021-05-12 01:35:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 81230d9fa1698271b4f6942418aff9ec SHA-1: b1145f6bc46a1d16361caf41cc9d5718ec21e1a8 SHA-256: d52e1379094d1c8457a53c023cd96a80614bf65c6513ce3a1219db8701f86a2d
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document employs a lure of 'free Robux' and game hacks to entice users to click on external links. These links lead to a large collection of other PDFs hosted on an IP address, suggesting a link farm or a method to distribute further malicious content. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9013

Heuristics 6

  • 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.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.xyz/app/431946152/free-robux-no-offers-game-hack PDF link annotation
    • http://183.91.70.7//repository/free-spins-on-coin-masters_GM406889139.pdfPDF link annotation
    • http://183.91.70.7/repository/free-online-games-like-minecraft_GM479516143.pdfIn PDF document text
    • http://183.91.70.7/repository/coin-master-unlimited-spin-hack_GM406889139.pdfIn PDF document text
    • http://183.91.70.7/repository/coin-master-hack-2021-free_GM406889139.pdfIn PDF document text
    • http://183.91.70.7/repository/coin-master-hack-no-survey_GM406889139.pdfIn PDF document text
    • http://183.91.70.7//repository/coin-master-heaven-free-spins_GM406889139.pdfIn PDF document text
    • http://183.91.70.7//repository/free-spins-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://183.91.70.7/repository/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://183.91.70.7/repository/free-25-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • http://183.91.70.7//repository/wurst-112_GM479516143.pdfIn PDF document text
    • http://183.91.70.7//repository/getrobux-come_GM431946152.pdfIn PDF document text
    • http://183.91.70.7//repository/hack-coin-master-ios-download_GM406889139.pdfIn PDF document text
    • http://183.91.70.7//repository/coin-master-apk-mod-free-download_GM406889139.pdfIn PDF document text
    • http://183.91.70.7/repository/roblox-mobile-hack_GM431946152.pdfIn PDF document text
    • http://183.91.70.7//repository/robux-hacks-2021_GM431946152.pdfIn PDF document text
    • http://183.91.70.7//repository/coin-master-hack-online-no-human-verification_GM406889139.pdfIn PDF document text
    • http://183.91.70.7//repository/coin-master-free-spins-and-free-coins_GM406889139.pdfIn PDF document text
    • http://183.91.70.7//repository/robux-fun-hack_GM431946152.pdfIn PDF document text
    • http://183.91.70.7//repository/coin-master-unlimited-coins-hack-apk-download_GM406889139.pdfIn PDF document text
    • http://183.91.70.7//repository/coin-master-free-coins-link_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000048ed.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48ED 28984 bytes
SHA-256: 0e21b2fa09aa5acbb936b7a4baf632d0a6d55b269f5b43cadd4361690eff0e09
font_01_sfnt_off00008bb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BB2 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off000098c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x98C3 18012 bytes
SHA-256: db6be32425767485114cb9000642ed63280f0807e0fe45793765b8e181fce2c0

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