Malicious PDF — malware analysis report

Static analysis result for SHA-256 90fb7f3c10d431e7…

MALICIOUS

PDF

45.6 KB Created: 2021-05-17 07:16:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 535d0bcd17c88972f302c71892ef1082 SHA-1: 0cb959545085887fc116914685b7c4554f460e4e SHA-256: 90fb7f3c10d431e7e4ec9046b36f7b1672284e079929677962f427539bb2496f
200 Risk Score

Malware Insights

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

This PDF document employs a lure related to free game items and hacks, impersonating the Microsoft brand to trick users. It contains multiple links that redirect to malicious infrastructure, specifically the URL https://netcdn.xyz/app/431946152/free-t-shirt-roblox-game-hack, which is associated with credential phishing and potentially further malware delivery. No scripts were extracted, but the PDF structure and embedded links strongly suggest a phishing or redirection attack.

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.
  • 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.xyz/app/431946152/free-t-shirt-roblox-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.xyz/app/431946152/free-t-shirt-roblox-game-hack In PDF document text
    • http://www.hlad.hr/files/minecraft-pvp-hacks_GM479516143.pdfIn PDF document text
    • http://www.hlad.hr/files/how-to-get-free-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.hlad.hr/files/roblox-svg-free_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/download-coin-master-apk-hacked_GM406889139.pdfIn PDF document text
    • http://www.hlad.hr/files/minecraft-complete-handbook_GM479516143.pdfIn PDF document text
    • http://www.hlad.hr/files/minecraft-realms-free-trial_GM479516143.pdfIn PDF document text
    • http://www.hlad.hr/files/free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/minecraft-noob-vs-pro-vs-hacker-vs-god_GM479516143.pdfIn PDF document text
    • http://www.hlad.hr/files/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/roblox-adopt-me-hacks-2021_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/coin-master-free-spins-for-today_GM406889139.pdfIn PDF document text
    • http://www.hlad.hr/files/free-robux-no-verify-2021_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/free-robux-no-survey_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/get-robux-com_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/coin-master-free-link-today_GM406889139.pdfIn PDF document text
    • http://www.hlad.hr/files/can-i-play-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/coin-master-free-gift-links-2021_GM406889139.pdfIn PDF document text
    • http://www.hlad.hr/files/spin-coin-master-free_GM406889139.pdfIn PDF document text
    • http://www.hlad.hr/files/how-to-get-free-snacks-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.hlad.hr/files/how-to-make-a-roblox-group-for-free_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000047bb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47BB 25540 bytes
SHA-256: 1d3889ec30c25a4aed6838e0961031280dbd92a79947b61d788662d366321355
font_01_sfnt_off000082ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82EE 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf
font_02_sfnt_off00008f96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F96 18340 bytes
SHA-256: 2d05e254e9d88d662aa6e20ca1badb4d8e3c9bd921fc5d0ad34db7ef5b503ac5

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