Malicious PDF — malware analysis report

Static analysis result for SHA-256 837988c82f5c0266…

MALICIOUS

PDF

45.6 KB Created: 2021-05-13 21:03:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 6ef700ef408396f4c188af7b7a689bc0 SHA-1: 1614e12d8e26186f0cd991a5d176c2fd17639563 SHA-256: 837988c82f5c0266e546da27e864caa716d2073c4af726354fb6e73e6e96445e
200 Risk Score

Malware Insights

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

The PDF document contains multiple links to malicious redirectors, disguised as 'free generator' or 'game hack' content. It also employs a fake CAPTCHA lure to trick users into interacting with the document, likely to initiate a download or redirect. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to lead users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

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/how-to-earn-robux-fast-game-hack In PDF document text
    • http://www.laborvetro.org/images/free-robux-no-password_GM431946152.pdfIn PDF document text
    • http://www.laborvetro.org/images/how-do-you-get-free-roebucks_GM431946152.pdfIn PDF document text
    • http://www.laborvetro.org/images/flip-master-coins-hack_GM406889139.pdfIn PDF document text
    • http://www.laborvetro.org/images/op-rewards-robux_GM431946152.pdfIn PDF document text
    • http://www.laborvetro.org/images/wurst-mc_GM479516143.pdfIn PDF document text
    • http://www.laborvetro.org/images/100-free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.laborvetro.org/images/coin-master-hack-without-verification-code-2021_GM406889139.pdfIn PDF document text
    • http://www.laborvetro.org/images/free-spin-coin-master-new-link_GM406889139.pdfIn PDF document text
    • http://www.laborvetro.org/images/coin-master-hack-spin-160-pro_GM406889139.pdfIn PDF document text
    • http://www.laborvetro.org/images/coin-master-card-collection-hack-apk_GM406889139.pdfIn PDF document text
    • http://www.laborvetro.org/images/free-robux-generator-no-human-verification-or-surveys_GM431946152.pdfIn PDF document text
    • http://www.laborvetro.org/images/free-robux-today_GM431946152.pdfIn PDF document text
    • http://www.laborvetro.org/images/free-spins-coin-master-blogspot_GM406889139.pdfIn PDF document text
    • http://www.laborvetro.org/images/get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://www.laborvetro.org/images/is-there-an-actual-hack-that-work-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.laborvetro.org/images/www-rbxhut-com_GM431946152.pdfIn PDF document text
    • http://www.laborvetro.org/images/free-pe_GM479516143.pdfIn PDF document text
    • http://www.laborvetro.org/images/tiradas-coin-master_GM406889139.pdfIn PDF document text
    • http://www.laborvetro.org/images/minecraft-116-free-download_GM479516143.pdfIn PDF document text
    • http://www.laborvetro.org/images/coin-master-hack-2021-android-apk_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_off000049e6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49E6 25364 bytes
SHA-256: 13c31f12bb7df0868db10c63596d78361db8953864ba170758847fa4d5d32f54
font_01_sfnt_off000083bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83BC 3400 bytes
SHA-256: 4b3e0f36ad1e0c7e3ea5c178fd2b4f097d1e01575fc6a4101a8b520db34dfe07
font_02_sfnt_off00008ee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EE6 18512 bytes
SHA-256: 3b39e5dfa20c565428b23675f3ccd7e93e2dea39b53dc9d5a0b1254e996b49c7

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