Malicious PDF — malware analysis report

Static analysis result for SHA-256 358a143baf9abc4f…

MALICIOUS

PDF

33.8 KB Created: 2021-07-01 22:02:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 1b59b970f893be0a0beabd20f0bce3ad SHA-1: 939faf5d428bbfaaae39f6870135be28b4049a9f SHA-256: 358a143baf9abc4f894fafa722560ce6b2a2047bfb6cf1d70dc126b52cad9f32
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links designed to lure users into clicking on a URL that leads to known malicious redirector infrastructure. The document body and embedded links promote 'free Robux' and game hacks, a common social engineering tactic. The primary malicious URL identified is http://netcdn.co/app/431946152/free-robux-websites-no-human-verification-2021-game-hack, which is flagged as a malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

Heuristics 4

  • 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.
  • 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 http://netcdn.co/app/431946152/free-robux-websites-no-human-verification-2021-game-hack In PDF document text
    • https://esl.hess.com.tw/image/data/files/free-spin-sites-for-coin-master_GM406889139.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/www-free-robux_GM431946152.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/how-to-get-50k-robux-for-free_GM431946152.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/how-to-get-free-robux-no-waiting-proof_GM431946152.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/free-coins-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/how-often-pokemon-go-free-download_GM1094591345.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/roblox-robux-hack-xyz_GM431946152.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/roblox-svg-free_GM431946152.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/console-free-admin-roblox_GM431946152.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/xbox-roblox-free-characters_GM431946152.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/minecraft-115-2-hacks_GM479516143.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/free-10-roblox-card_GM431946152.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/robux-offer-wall_GM431946152.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/free-robux-without-verification_GM431946152.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/roblox-generator-no-verification_GM431946152.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/coin-master-free-coins-spins_GM406889139.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/hackear-coin-master-espaol_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002b01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B01 22368 bytes
SHA-256: 5b11210b52e5158212689b236df77912e438650ca6cb996f20722a494e3d087a
font_01_sfnt_off00005cb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CB8 19936 bytes
SHA-256: 2d8e841dd1971c2fee980e4b550b7ff584f268363bd4d8abb569452530db8a10

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