Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1a8cd622f81695f…

MALICIOUS

PDF

38.0 KB Created: 2021-06-28 01:48:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 317a6a5739255991af4a2845e2b5a7dc SHA-1: 82640170ec75e329e6011c5fba8f8dcf1de1c0b2 SHA-256: e1a8cd622f81695f51de1235c3786ae8753b3240c0e89b1b5a563359445ac101
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector infrastructure, specifically http://netcdn.co/app/431946152/free-robux-codes-and-obc-game-hack. The document body and embedded URLs suggest a lure for free game currency or hacks, a common tactic for phishing and malware distribution. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.co/app/431946152/free-robux-codes-and-obc-game-hack In PDF document text
    • https://opac.heritagejkt.org/repository/pastebin-hack-robux-by-hacks-de-juegos-apk_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/free-robux-ad_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/free-robux-no-scam_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/free-printable-roblox-images_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/coin-master-apk-hack-2021-ios_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/free-minecraft-skins-ps4_GM479516143.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/coin-master-free-spin-and-trading_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/free-roblox-tutorials_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/freer-robux-codes_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/roblox-hack-jailbreak-dll_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/free-robux-with-no-human-verification_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/how-to-make-free-robux_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/free-clothes-for-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/coin-master-game-android-free-download_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/roblox-jailbreak-hack-download_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/free-robux-earn_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/free-premium-roblox_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
stream_002_off00003ae5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3AE5 23516 bytes
SHA-256: 17e85f87c0d02bab48fa8da56ebb07084ce45790f08884a1d0201b594ba5226b
font_01_sfnt_off00007013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7013 18888 bytes
SHA-256: b7cd453250a27dda1af9b2248598f79f5697e32dfd3c686ccca5911a3204a81d

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