Malicious PDF — malware analysis report

Static analysis result for SHA-256 a421be118c808b63…

MALICIOUS

PDF

45.1 KB Created: 2021-05-19 19:39:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 70134abdb19fc9b003e56e04c83c10d1 SHA-1: 66d530c283f2dba875d655333d7be17170102f4e SHA-256: a421be118c808b63f3b765df480ce3b834280362806448fc90d8d10881875d2f
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links designed to redirect users to external websites, masquerading as free game currency generators or hacks. The primary malicious link identified is https://netcdn.xyz/app/406889139/free-spins-coin-master-links-game-hack, which is flagged as a known malicious redirector. The document also hosts a large number of links pointing to other PDFs on sbairs.com, likely part of an SEO spam or link farm operation to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9621

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-spins-coin-master-links-game-hack In PDF document text
    • http://www.sbairs.com/datas/files/coin-master-claim-free-spins_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/coin-master-heaven-daily-free-spins_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/www-robux-redeem_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/how-do-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/minecraft-app-free-download_GM479516143.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/minecraft-fly-hack_GM479516143.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/daily-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/coin-master-70-spin-link-today_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/free-spins-and-coins-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/how-to-get-free-food-for-foxy-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/free-spin-coin-master-twitter_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/get-free-gold-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/coin-master-twitter_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/how-to-hack-roblox-games_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/coin-master-hack-tool-2021_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/best-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/coin-master-free-coins-and-spins-daily_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/free-robux-generator-no-survey_GM431946152.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_off0000482a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x482A 27472 bytes
SHA-256: faefa6cfecb32dd78ed6b05a62e6caf5b974e680ce5f604d167f834f91638664
font_01_sfnt_off000084cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84CF 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00008e80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E80 18056 bytes
SHA-256: 07f1a9832fff0ce02b8ea8bcbd6448fb7022c7ac6c85a00fb5b887865844234a

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