Malicious PDF — malware analysis report

Static analysis result for SHA-256 90a530cb1d174489…

MALICIOUS

PDF

34.5 KB Created: 2021-07-09 04:32:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 376960ef776d5ba8d8cf439827474630 SHA-1: aa1cde66d640ed1c920c5eaaa73d828fce417ba3 SHA-256: 90a530cb1d174489b7ab99d43c69e93dc1c98db18200f78ca6013b2098cd5d0b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a redirector hosted at http://netcdn.tw/app/431946152/free-robux-generator-for-roblox-2021-game-hack. This redirector is associated with malicious activity, likely leading users to phishing sites or malware downloads. The document body and heuristics indicate a lure related to game hacks and generators, a common social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.tw/app/431946152/free-robux-generator-for-roblox-2021-game-hack In PDF document text
    • https://humansci.kyst.com.tw/image/data/files/john-doe-roblox-hacker_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/free-robux-apk-october-2021_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/coin-master-spin-hack-2021_GM406889139.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/coin-master-free-spins-link-no-verification-2021_GM406889139.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/no-scam-free-robux_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/how-to-get-free-minecoins-in-minecraft_GM479516143.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/roblox-troll-outfits-free_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/free-robux-gift-card_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/minecraft-items_GM479516143.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/claimrbx-free-robux_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/how-can-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/how-to-hack-roblox-android-step-by-step-anddoid_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/doctor-louie-roblox_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/roblox-free-robux-website_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/how-to-get-minecoins-in-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/roblox-dragon-ball-final-stand-hack-script_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/roblox-free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/pubg-uc-on-discount_GM1330123889.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/mathep_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/free-robux-no-verify-or-password-needed_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
font_00_sfnt_off00002fc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FC5 22252 bytes
SHA-256: 66d4079c15db9af6e91444b686e12bfbd21a2738f6cc12d4241e90b301da5c32
font_01_sfnt_off000060de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60DE 19296 bytes
SHA-256: 1c5b5ef18537994d2b9d4bcfadda653dfd61b801510ea22c778e1317dc9212ff

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