Malicious PDF — malware analysis report

Static analysis result for SHA-256 af425dea19e59fee…

MALICIOUS

PDF

43.8 KB Created: 2021-06-03 07:09:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 3b80f1895db60cc1642c6629464efa4d SHA-1: d476cc31f87d7221fcfdcb47dfb44ce5a8e98c9c SHA-256: af425dea19e59feef6d0834abd0595d70cb09115d85608e4020f04220200f01e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and lures users with promises of free game items. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates that the document links to malicious infrastructure, and the 'PDF_GAME_HACK_REDIRECT_LURE' specifically points to a game hack generator. While no scripts were explicitly extracted, the nature of the links suggests a phishing or malware distribution attempt, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/406889139/free-spins-and-coins-for-coin-master-game-game-hack In PDF document text
    • https://www.poc-helmet.com/ckfinder/userfiles/files/pubg-uc-apk_GM1330123889.pdfIn PDF document text
    • https://www.poc-helmet.com/ckfinder/userfiles/files/bux-gg-robux-free_GM431946152.pdfIn PDF document text
    • https://www.poc-helmet.com/ckfinder/userfiles/files/coin-master-free-spins-hack-2021_GM406889139.pdfIn PDF document text
    • https://www.poc-helmet.com/ckfinder/userfiles/files/coin-master-rewards-free-spins_GM406889139.pdfIn PDF document text
    • https://www.poc-helmet.com/ckfinder/userfiles/files/easy-way-to-get-robux_GM431946152.pdfIn PDF document text
    • https://www.poc-helmet.com/ckfinder/userfiles/files/mobihack-net-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.poc-helmet.com/ckfinder/userfiles/files/robux-download_GM431946152.pdfIn PDF document text
    • https://www.poc-helmet.com/ckfinder/userfiles/files/free-coin-master-links_GM406889139.pdfIn PDF document text
    • https://www.poc-helmet.com/ckfinder/userfiles/files/coin-master-200-spin-link_GM406889139.pdfIn PDF document text
    • https://www.poc-helmet.com/ckfinder/userfiles/files/roblox-booga-booga-hack_GM431946152.pdfIn PDF document text
    • https://www.poc-helmet.com/ckfinder/userfiles/files/free-robux-com-2021_GM431946152.pdfIn PDF document text
    • https://www.poc-helmet.com/ckfinder/userfiles/files/coin-master-free-rare-cards_GM406889139.pdfIn PDF document text
    • https://www.poc-helmet.com/ckfinder/userfiles/files/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • https://www.poc-helmet.com/ckfinder/userfiles/files/roblox-install-free_GM431946152.pdfIn PDF document text
    • https://www.poc-helmet.com/ckfinder/userfiles/files/free-minecraft-bedrock-server_GM479516143.pdfIn PDF document text
    • https://www.poc-helmet.com/ckfinder/userfiles/files/coin-master-free-spins-today-new_GM406889139.pdfIn PDF document text
    • https://www.poc-helmet.com/ckfinder/userfiles/files/free-robux-websites-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.poc-helmet.com/ckfinder/userfiles/files/https-iosgodscom-topic-20218flipmastercoinshack_GM406889139.pdfIn PDF document text
    • https://www.poc-helmet.com/ckfinder/userfiles/files/rbxoffer-com-free-robux_GM431946152.pdfIn PDF document text
    • https://www.poc-helmet.com/ckfinder/userfiles/files/microsoft-rewards-robux_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_004_off000050e4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50E4 24628 bytes
SHA-256: d6d29a980365d256b001ef82ec870494153938ad900cb7fe2c0f2f7a273642a5
font_01_sfnt_off000088ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88AB 18320 bytes
SHA-256: d1cf6b486e789d6a7a281824944966070be141b92be060b449a52bae7023ebff

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