Malicious PDF — malware analysis report

Static analysis result for SHA-256 e90dc3c241613bf5…

MALICIOUS

PDF

48.1 KB Created: 2021-06-03 23:37:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 37fb56c3f42e8853efe8627bd765eb00 SHA-1: 12d36b90fbfa1be9750473623def7402e82d7efa SHA-256: e90dc3c241613bf5043f675a2d88119cbc9a4f019de2a7d53f212eee7170d839
160 Risk Score

Malware Insights

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

This PDF document contains multiple links to a known malicious redirector infrastructure, specifically advertising free Robux generators. The document body and embedded URLs suggest a lure to trick users into visiting these sites, likely to download further malware or engage in credential harvesting. While no scripts were explicitly extracted, the PDF structure and the nature of the links strongly indicate an attempt to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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 https://netcdn.online/app/431946152/bux-gg-robux-free-game-hack In PDF document text
    • https://opac.heritagejkt.org//repository/roblox-robux-generator_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/how-to-get-free-roebucks-in-roblox_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/is-there-a-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/mcpe-com_GM479516143.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/coin-master-free-spins-link-2021-no-verification-deutsch_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/coin-master-free-spins-coins_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/free-spins-coin-master-links-no-human-verification_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/minecraft-bedrock-download-pc-free_GM479516143.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/free-robux-without-verify_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/coin-master-online-hack-generator_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/coin-blogspot_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/freespinandcoin-blogspot-coin-master_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/robux-free-online_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/free-coin-master-androd-cheats-2021_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/coin-master-hacksco_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/coin-master-free-spins-link-haktuts_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/instagram-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/free-coin-master-spins-link_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/coin-master-mod-apk-latest-hack-with-unlimited-free-spins_GM406889139.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_004_off00005266.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5266 25384 bytes
SHA-256: c48685f40377702095a79efb3c67ad6bbcd1139df8310205b2daeeb285c9dfd6
font_01_sfnt_off00008c8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C8B 3884 bytes
SHA-256: 64ea6bfd232c3abde76d8b86727203bfa3f935a5783cd0c1f642cf6d3fb42b29
font_02_sfnt_off00009933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9933 18304 bytes
SHA-256: 8d8733a7c40ec122fa0656e79a44d71687d26648648a8c1fb15c9a660e1bc95a

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