Malicious PDF — malware analysis report

Static analysis result for SHA-256 16b83702afb18715…

MALICIOUS

PDF

49.7 KB Created: 2021-05-19 15:33:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 290a82809c25b5b4428f332ef3e72ff2 SHA-1: 794ae247d62feb140e020a2f9af021f173a505a0 SHA-256: 16b83702afb18715d3d98ac3bbdfbb1ebb4d4e00c2bc965ea3b43046c8e01647
260 Risk Score

Malware Insights

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

The PDF document contains numerous links, including one to a known malicious redirector, disguised as a 'free generator / game hack'. It also presents a fake CAPTCHA or human verification prompt to trick users into interacting with the malicious content. The presence of multiple links and the fake CAPTCHA strongly suggest a phishing or scam attempt, likely leading to further malware downloads or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8642

Heuristics 6

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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-on-coin-master-link-game-hack In PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/how-to-get-free-roebucks-without-verification_GM431946152.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/wurst-hacked-client_GM479516143.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/earn-robux-websites_GM431946152.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/coin-master-apk-hack-download_GM406889139.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/free-spins-for-coin-master-without-human-verification_GM406889139.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/coin-master-hack-xyz-download-free_GM406889139.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/free-chest-coin-master_GM406889139.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/how-to-get-free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/roblox-script-hack_GM431946152.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/coin-master-free-spins-link-blogspot-2021_GM406889139.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/rbx-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/coin-master-fun-free-spins_GM406889139.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/can-i-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/free-robux-pastebin_GM431946152.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/coin-master-free-spins-link-june-2021_GM406889139.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/www-robux-us_GM431946152.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/free-minecraft-mods-for-xbox-one_GM479516143.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/how-do-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004984.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4984 24652 bytes
SHA-256: 7296363fb398cacffdd5d6edc82ca8e0cae0fe27b9a9d3ecd9c573eca07afe7b
font_01_sfnt_off00008249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8249 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00008bf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BF6 8676 bytes
SHA-256: e06aca5f85e50ae6cefda302c5299c18ab6d27c174f74f0bb0ee8efa7ccb4468
font_03_sfnt_off0000a081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA081 18056 bytes
SHA-256: 892ebf3b86ae534fd3f474e2c239da2a9bb4dc91f8225dc09222a78aadec1336

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