Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b9c12b67d5d7616…

MALICIOUS

PDF

44.9 KB Created: 2021-05-17 08:02:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 81d7f8a772df2f7976cafa3d16395d8c SHA-1: d66c123ab1d109411b43aa57bc91f5ec9603a6b4 SHA-256: 2b9c12b67d5d7616512b04e5b228c1e86722863ef954177e4ab7fbffcaac599d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically advertising 'free generator / game hack' lures. These redirectors, such as https://netcdn.xyz/app/406889139/coin-master-free-coins-and-spins-blogspot-game-hack, likely serve to host further malicious content or phishing pages. The document body and embedded links strongly suggest a social engineering tactic to trick users into clicking through to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

Heuristics 4

  • 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.
  • 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/coin-master-free-coins-and-spins-blogspot-game-hack In PDF document text
    • http://fs4sms.com/images/master-free-spin-and-coin-link_GM406889139.pdfIn PDF document text
    • http://fs4sms.com/images/coin-master-hack-android-2021_GM406889139.pdfIn PDF document text
    • http://fs4sms.com/images/claim-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://fs4sms.com/images/how-do-you-get-roebucks-for-free_GM431946152.pdfIn PDF document text
    • http://fs4sms.com/images/op-rewards-free-robux_GM431946152.pdfIn PDF document text
    • http://fs4sms.com/images/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdfIn PDF document text
    • http://fs4sms.com/images/coin-master-hack-without-verification-code_GM406889139.pdfIn PDF document text
    • http://fs4sms.com/images/coin-master-free-spins-link-quora_GM406889139.pdfIn PDF document text
    • http://fs4sms.com/images/free-robux-giveaway-live_GM431946152.pdfIn PDF document text
    • http://fs4sms.com/images/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://fs4sms.com/images/coin-master-spin-blogspot_GM406889139.pdfIn PDF document text
    • http://fs4sms.com/images/free-robux-with-no-survey_GM431946152.pdfIn PDF document text
    • http://fs4sms.com/images/how-to-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://fs4sms.com/images/free-free-robux_GM431946152.pdfIn PDF document text
    • http://fs4sms.com/images/free-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://fs4sms.com/images/free-roblox-animations_GM431946152.pdfIn PDF document text
    • http://fs4sms.com/images/free-spin-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://fs4sms.com/images/how-to-get-minecraft-for-free-on-chromebook_GM479516143.pdfIn PDF document text
    • http://fs4sms.com/images/coin-master-hacks-no-verification_GM406889139.pdfIn PDF document text
    • http://fs4sms.com/images/free-robux-groups-2021_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
font_00_sfnt_off00004840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4840 25108 bytes
SHA-256: 8386220353449bd03ee98bce251508190643663a1393064df59f52edced10a7b
font_01_sfnt_off00008218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8218 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00008bca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BCA 18636 bytes
SHA-256: 88ae2d3fcbda70c0dfe18bfa3c12f6e9cf10d469e04612efd9d0bb36059ec53b