Malicious PDF — malware analysis report

Static analysis result for SHA-256 81d39d8647003074…

MALICIOUS

PDF

52.2 KB Created: 2021-06-11 05:05:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: d72067f30cad00810840a1ccd882dc3b SHA-1: 5bcee18654c663a074825d5d3a7946e34807ac8d SHA-256: 81d39d8647003074a718e20df0f2b65ec9675576aa109db306e10a432e9ed37c
200 Risk Score

Malware Insights

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

This PDF file contains multiple links to a redirector URL that is associated with malicious activity and impersonates the eBay brand. The document body and heuristics suggest a lure for game hacks or generators, likely intended to phish credentials or deliver a second-stage payload. No scripts were extracted, but the embedded links and the nature of the lure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9862

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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.tw/app/431946152/roblox-hack-free-2021-blogspot-game-hack.
  • 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.tw/app/431946152/roblox-hack-free-2021-blogspot-game-hack In PDF document text
    • http://www.buapit.ac.th/UserFiles/File/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/comment-hacker-robux-sur-telephone_GM431946152.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/any-roblox-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/como-hackear-coin-master-gratis_GM406889139.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/free-robux-hacker-us_GM431946152.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/coin-master-attack-block-hack_GM406889139.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/free-robux-app-2021_GM431946152.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/how-to-hack-accounts-in-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/free-spin-coin-master-instagram_GM406889139.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/mc-update_GM479516143.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/coin-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/roblox-acessories-script-hack_GM431946152.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/easy-robux-generator_GM431946152.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/coin-master-gold-cards-free_GM406889139.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/minecraft-bedrock-edition-free_GM479516143.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/minecraft-pe-free-download-android_GM479516143.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/pubg-for-uc-free_GM1330123889.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/free-robux-glitch_GM431946152.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/what-do-roblox-points-do_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 6

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_004_off000051db.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51DB 39412 bytes
SHA-256: 380e1a6e25651ff5ba3ab235046496bb2644935113498798dc5a56aef813c07e
font_01_sfnt_off0000a701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA701 19316 bytes
SHA-256: 746a0d2a59448c535bd75a4d82e9ee3fe997b597e91569c97e9c5ed33bb3722c

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