Malicious PDF — malware analysis report

Static analysis result for SHA-256 e72d64144ac6b022…

MALICIOUS

PDF

44.8 KB Created: 2021-05-14 22:33:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 7d36f18ff16debea281e633919fad496 SHA-1: 09c9058bec0a0143b3e27e1998b53dad9ec2f520 SHA-256: e72d64144ac6b022a2412489da5e56bad024bb3086e4e6de3529e182f7cbc89d
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is designed as a lure, presenting itself as a 'free generator' or 'game hack' to entice users. It contains numerous links, including a primary malicious redirector URL, that likely lead to further malicious content or phishing pages. The PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, suggesting a tactic to distribute malicious content widely. No scripts were extracted, but the document's structure and embedded links strongly suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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
  • 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/best-way-to-get-free-robux-game-hack In PDF document text
    • http://www.pacoestrada.it/images/coin-master-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://www.pacoestrada.it/images/coin-master-free-spin-and-coins-links_GM406889139.pdfIn PDF document text
    • http://www.pacoestrada.it/images/free-coin-spin-daily-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://www.pacoestrada.it/images/roblox-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://www.pacoestrada.it/images/free-robux-discord_GM431946152.pdfIn PDF document text
    • http://www.pacoestrada.it/images/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://www.pacoestrada.it/images/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://www.pacoestrada.it/images/coin-master-hacker-club_GM406889139.pdfIn PDF document text
    • http://www.pacoestrada.it/images/actual-free-robux_GM431946152.pdfIn PDF document text
    • http://www.pacoestrada.it/images/free-spin-codes-coin-master_GM406889139.pdfIn PDF document text
    • http://www.pacoestrada.it/images/free-minecraft-texture-packs-java_GM479516143.pdfIn PDF document text
    • http://www.pacoestrada.it/images/free-robux-no-email_GM431946152.pdfIn PDF document text
    • http://www.pacoestrada.it/images/rbx-hut-promo-codes_GM431946152.pdfIn PDF document text
    • http://www.pacoestrada.it/images/websites-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://www.pacoestrada.it/images/free-robux-websites-that-actually-work_GM431946152.pdfIn PDF document text
    • http://www.pacoestrada.it/images/coin-master-free-spins-1-coin-master_GM406889139.pdfIn PDF document text
    • http://www.pacoestrada.it/images/how-to-get-free-spins-on-coin-master-2021-links_GM406889139.pdfIn PDF document text
    • http://www.pacoestrada.it/images/minecraft-free-ios-2021_GM479516143.pdfIn PDF document text
    • http://www.pacoestrada.it/images/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.pacoestrada.it/images/how-to-get-a-free-minecraft-account_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_003_off0000485a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x485A 29416 bytes
SHA-256: 88c6bfe06259c6572e7f5f1c245d219d22836f0e4340178c62c6ab241f14f740
font_01_sfnt_off00008ba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BA0 18724 bytes
SHA-256: 0e67c697191027b8b448214b8413bf6f3ed0ff1165507b95d6a34aabcad7a82f

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