Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a5110f180c86e89…

MALICIOUS

PDF

44.3 KB Created: 2021-05-17 13:16:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 2f54eb395099b2aadc88c954d5101e58 SHA-1: 44ac9d030efbd885c7d161ed562d04bcc4268653 SHA-256: 1a5110f180c86e893b3145f34a958425cd8c652aad14a5dd2592ca7cf881195d
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous links designed to lure users to external websites, masquerading as game hacks and generators. One primary URL, https://netcdn.xyz/app/406889139/free-coins-coin-master-blog-game-hack, is identified as a malicious redirector. The document body and heuristics indicate a mass link farm strategy, likely intended to drive traffic to potentially malicious sites or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9648

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/406889139/free-coins-coin-master-blog-game-hack In PDF document text
    • http://www.hhls.com.au/images/free-spins-and-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.hhls.com.au/images/free-robux-mobile_GM431946152.pdfIn PDF document text
    • http://www.hhls.com.au/images/free-robux-only-username-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.hhls.com.au/images/coin-master-free-spins-2021-no-human-verification_GM406889139.pdfIn PDF document text
    • http://www.hhls.com.au/images/hack-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://www.hhls.com.au/images/regal-world-coin-master_GM406889139.pdfIn PDF document text
    • http://www.hhls.com.au/images/how-to-get-free-robux-without-email_GM431946152.pdfIn PDF document text
    • http://www.hhls.com.au/images/coin-master-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • http://www.hhls.com.au/images/coin-master-online-hack-link_GM406889139.pdfIn PDF document text
    • http://www.hhls.com.au/images/free-coin-master-coins_GM406889139.pdfIn PDF document text
    • http://www.hhls.com.au/images/bloxawards-com-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://www.hhls.com.au/images/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.hhls.com.au/images/coin-master-free-spins-no-survey_GM406889139.pdfIn PDF document text
    • http://www.hhls.com.au/images/coin-master-100-spin-hack_GM406889139.pdfIn PDF document text
    • http://www.hhls.com.au/images/free-robux-codes-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.hhls.com.au/images/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://www.hhls.com.au/images/coin-master-hack-app-for-ios_GM406889139.pdfIn PDF document text
    • http://www.hhls.com.au/images/what-games-give-you-robux_GM431946152.pdfIn PDF document text
    • http://www.hhls.com.au/images/80-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.hhls.com.au/images/best-free-minecraft-server-hosting-reddit_GM479516143.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_off00004801.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4801 24996 bytes
SHA-256: 771322de88bb2e872c321436f213f788183a22b8e7a54aaebf53d5a70d6ff025
font_01_sfnt_off000080c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80C5 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00008a76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A76 18288 bytes
SHA-256: 525699ae71861fffeab431a07c950b4914d38a871fb98becad0e0bea9ac3f1df

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