Malicious PDF — malware analysis report

Static analysis result for SHA-256 31ff93c63bf83374…

MALICIOUS

PDF

47.9 KB Created: 2021-05-15 02:45:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: dfad9d6ae5472487ef1605d983d0c2b1 SHA-1: 9eb421fc67ceaf17b6fd0c57c5df04b1df569ff1 SHA-256: 31ff93c63bf83374aede1cbe319c860fafc897165854c9e12715ea5c0c0b5b5d
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a callback-phone (TOAD) lure. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9013

Heuristics 5

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/406889139/coin-master-free-spins-2-5-2021-game-hack PDF link annotation
    • https://www.gornjastubica.hr/files/get-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://gornjastubica.hr/files/wahoogaming-co-free-robux_GM431946152.pdfIn PDF document text
    • http://gornjastubica.hr/files/free-robux-mobile_GM431946152.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/roblox-data-breach_GM431946152.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/free-robux-real-2021_GM431946152.pdfIn PDF document text
    • http://gornjastubica.hr/files/how-to-get-minecraft-pe-for-free-ios_GM479516143.pdfIn PDF document text
    • http://gornjastubica.hr/files/como-hackear-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/100-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/haktuts-coin-master-free-spin-today_GM406889139.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/free-coins-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://gornjastubica.hr/files/how-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://gornjastubica.hr/files/coin-master-free-coins-link_GM406889139.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/minecraft-building-hacks_GM479516143.pdfIn PDF document text
    • http://gornjastubica.hr/files/hack-coin-master-nyc_GM406889139.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/how-to-hack-roblox-accounts-on-phone-2021_GM431946152.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/links-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/free-minecraft-account-generator_GM479516143.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/roblox-zone-free-robux_GM431946152.pdfIn PDF document text
    • http://gornjastubica.hr/files/robux-com-free-robux_GM431946152.pdfIn PDF document text
    • http://gornjastubica.hr/files/coin-master-hack-pro_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000046d8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x46D8 35472 bytes
SHA-256: 18e47b4e4fee6d2c8ffc13191bbac0e7ca4458a80e026a37c66e5d5983fd729e
font_01_sfnt_off00008e67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E67 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00009852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9852 18420 bytes
SHA-256: fc9c1cd0ccc985f14e0cb904a615d0991f1fd615bf6bb58e7d206b3ec4fad204

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