Malicious PDF — malware analysis report

Static analysis result for SHA-256 d85b8f5635c9836d…

MALICIOUS

PDF

42.2 KB Created: 2021-05-18 04:46:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 98aac04ec8d6a355a623ef2d47485053 SHA-1: d15111a1d474541686828aecc137e70204483884 SHA-256: d85b8f5635c9836db636b50f3c84281040a81f59a543d57c25936c27ae2cb14c
200 Risk Score

Malware Insights

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

The PDF document contains multiple links to known malicious redirectors and lures users with fake CAPTCHA prompts and 'game hack' content. The primary goal appears to be directing users to malicious websites that likely host further malware or phishing content. No scripts were extracted, but the embedded URLs and the fake CAPTCHA heuristic strongly indicate a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.
  • 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/431946152/roblox-free-printables-game-hack In PDF document text
    • http://regnataudio.com/images/pop-slots-free-vegas-casino-slot-machine-game-coin-master_GM406889139.pdfIn PDF document text
    • http://regnataudio.com/images/coin-master-redeem-code-free_GM406889139.pdfIn PDF document text
    • http://regnataudio.com/images/coin-master-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://regnataudio.com/images/minecraft-free-download-no-virus_GM479516143.pdfIn PDF document text
    • http://regnataudio.com/images/how-to-log-out-of-coin-master_GM406889139.pdfIn PDF document text
    • http://regnataudio.com/images/coin-master-app-free-download_GM406889139.pdfIn PDF document text
    • http://regnataudio.com/images/free-roblox-accounts-with-robux_GM431946152.pdfIn PDF document text
    • http://regnataudio.com/images/coin-master-hack-apk-facebook-login_GM406889139.pdfIn PDF document text
    • http://regnataudio.com/images/coin-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://regnataudio.com/images/is-it-possible-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://regnataudio.com/images/coin-master-free-soins_GM406889139.pdfIn PDF document text
    • http://regnataudio.com/images/coin-master-hacks-for-cards_GM406889139.pdfIn PDF document text
    • http://regnataudio.com/images/coin-master-free-coins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://regnataudio.com/images/robux-hacks-2021_GM431946152.pdfIn PDF document text
    • http://regnataudio.com/images/get-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://regnataudio.com/images/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://regnataudio.com/images/free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • http://regnataudio.com/images/coin-master-latest-version-hack_GM406889139.pdfIn PDF document text
    • http://regnataudio.com/images/coin-master-free-food-for-pet_GM406889139.pdfIn PDF document text
    • http://regnataudio.com/images/free-coin-master-hack-no-verification_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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000048ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x48CE 24828 bytes
SHA-256: a0c714f332f94455dc2e992cddc7c89d46f8821119504b2ddb383edb1c5ffb74
font_01_sfnt_off000081f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81F0 18552 bytes
SHA-256: b7813c1cf5855ff7333da4fa1e106f27e1bbe272df09c79a879bc8b995579971

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