Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1c3d8e8879fd1aa…

MALICIOUS

PDF

44.0 KB Created: 2021-05-13 18:39:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 106b6236b0288d900c777fb636f51893 SHA-1: a991d89f1ea87fc8330c25f6a4dc4169c52796a5 SHA-256: e1c3d8e8879fd1aa86843d99d83524c3efd81d8550e465e3228492f5806ed9aa
200 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure and links to known malicious redirectors, aiming to trick users into visiting sites that offer game hacks. The document body and embedded URLs suggest a social engineering tactic to drive traffic to potentially malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a malicious redirector workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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-do-you-get-roebucks-game-hack In PDF document text
    • https://learnwmf.org/image/data/files/hacks-master-coin_GM406889139.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/free-roblox-svg_GM431946152.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/coin-master-get-free-spins_GM406889139.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/coin-master-hack-app_GM406889139.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/download-coin-master-apk-hacked_GM406889139.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/free-roblox-generator-for-roblox_GM431946152.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/free-spins-coins-coin-master_GM406889139.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/minecraft-windows-10-edition-free-download_GM479516143.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/free-spins-for-coin-masters_GM406889139.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/robux-hack-generator_GM431946152.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/coin-master-free-spins-for-today_GM406889139.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/how-to-get-hacks-on-roblox_GM431946152.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/minecraft-for-ps3-free_GM479516143.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/free-robux-games-that-actually-work_GM431946152.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/free-roblox-executor-no-key_GM431946152.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/free-robux-download_GM431946152.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/roblox-gift-card-free-codes_GM431946152.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/roblox-free-robux-no-verification_GM431946152.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
stream_003_off00004928.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4928 27804 bytes
SHA-256: b7356fd14e9fd69a406437527bd69c8648132818be1916c6e004b019d9cbbdc9
font_01_sfnt_off0000891c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x891C 18408 bytes
SHA-256: ff346f93049ac2d3fb32d8a2c4dbad06720bfee6e4c1cdd193d0bff0cdbf25c6

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