Malicious PDF — malware analysis report

Static analysis result for SHA-256 28673d81fa5ab773…

MALICIOUS

PDF

34.1 KB Created: 2021-06-29 03:24:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: ab93386a32261669027d43291c92ac3b SHA-1: 6bd3b463026cde4b7e731e60bce47e12be3e390c SHA-256: 28673d81fa5ab7734ca7466a8c5149744a054f2af67ce3e3b3378aab1c07e18b
188 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document contains XFA form elements and is malformed, indicating it is likely an exploit. It contains a critical heuristic firing for a malicious redirector link, specifically http://netcdn.co/app/431946152/how-get-free-stuff-in-roblox-game-hack, which is presented as a lure for free game items. The document body and embedded URLs reinforce this lure, aiming to trick the user into clicking the malicious link, which likely leads to further exploitation or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • 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/how-get-free-stuff-in-roblox-game-hack In PDF document text
    • http://gornjastubica.hr/files/roblox-free-robux-by-roblox_GM431946152.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/free-coin-master-hacks-no-verification-or-survey_GM406889139.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/how-to-get-minecraft-for-free-on-ps4-2021_GM479516143.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/how-to-get-a-free-minecraft-account_GM479516143.pdfIn PDF document text
    • http://gornjastubica.hr/files/minecraft-servers-that-allow-hacks_GM479516143.pdfIn PDF document text
    • http://gornjastubica.hr/files/free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/free-robux-clothes_GM431946152.pdfIn PDF document text
    • http://gornjastubica.hr/files/free-robux-1-2021202120210_GM431946152.pdfIn PDF document text
    • http://gornjastubica.hr/files/hacks-roblox-cambiar-nombre_GM431946152.pdfIn PDF document text
    • http://gornjastubica.hr/files/minecraft-apk-free-download-016-0_GM479516143.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/jailbreak-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/funbloxxyz-free-robux_GM431946152.pdfIn PDF document text
    • http://gornjastubica.hr/files/free-coin-spin-daily-link-coin-master_GM406889139.pdfIn PDF document text
    • http://gornjastubica.hr/files/extra-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://gornjastubica.hr/files/roblox-army-free-robux_GM431946152.pdfIn PDF document text
    • http://gornjastubica.hr/files/how-to-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://gornjastubica.hr/files/how-to-get-free-robux-gift-cards_GM431946152.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/minecraft-pc-free_GM479516143.pdfIn PDF document text
    • http://gornjastubica.hr/files/boost9-com-roblox-hack_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_off00002dc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DC8 22476 bytes
SHA-256: 23ab1bc77e72ac020af4612c71afd38320df5431de1fe037ad95529e88be2ea9
font_01_sfnt_off0000600e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x600E 19056 bytes
SHA-256: d1b2f2ae1c065a5af75e54e3a08b5fb54a194d9925235f77479792ad8555b48f

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