Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a997ecf4b1b7526…

MALICIOUS

PDF

51.1 KB Created: 2021-06-08 23:04:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-14
MD5: cc7acda631c15917ab716dcf2d244b49 SHA-1: d3f9f87e75a84159e9456d0f4ed7586cb046c504 SHA-256: 9a997ecf4b1b752665678a02f17822d27ee4e8793f83418f349c33a95a65ad5d
160 Risk Score

Malware Insights

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

This PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting a 'game hack' lure. The presence of a visual download button and the ML classifier's high confidence score indicate a malicious intent to trick users into visiting potentially harmful sites. No scripts were extracted, but the document's structure and embedded URLs strongly suggest it's part of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9724

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.tw/app/431946152/noclip-roblox-hack-download-2021-game-hack In PDF document text
    • https://www.manmed.info:443/images/can-you-get-robux-for-free_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/how-to-get-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/minecraft-launcher-free_GM479516143.pdfIn PDF document text
    • https://www.manmed.info:443/images/coin-master-34-4-free-download_GM406889139.pdfIn PDF document text
    • https://www.manmed.info:443/images/free-ways-to-get-robux_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/free-robux-mobile_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/hack-robux_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/coin-master-free-spins-2021-today_GM406889139.pdfIn PDF document text
    • https://www.manmed.info:443/images/free-tiktok-app_GM835599320.pdfIn PDF document text
    • https://www.manmed.info:443/images/play-minecraft-pocket-edition-for-free_GM479516143.pdfIn PDF document text
    • https://www.manmed.info:443/images/how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/2021-bhop-hack-roblox_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/tiktok-views-free_GM835599320.pdfIn PDF document text
    • https://www.manmed.info:443/images/robux-generator-without-human-verification_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/free-cheat-codes-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.manmed.info:443/images/how-to-get-free-robux-without-verifying_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/minecraft-name-tag-hacks_GM479516143.pdfIn PDF document text
    • https://www.manmed.info:443/images/minecraft-realms-free-trial_GM479516143.pdfIn PDF document text
    • https://www.manmed.info:443/images/free-roblox-accounts-with-builders-club_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/coin-master-free-spin-link-today-2021_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_off000053a5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x53A5 27400 bytes
SHA-256: 8475d36b99f9d7e69ab32d64f94b365b300f594e87e232eb4915134dc625c023
font_01_sfnt_off0000946e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x946E 4000 bytes
SHA-256: feeed96d409c09c381a56d3c228213f672da467eef0c3f0dca4092e76a664459
font_02_sfnt_off0000a19d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA19D 19388 bytes
SHA-256: 5d4203e064c879417db6b557c29e6287012fd67b9e55c2deb613cebd12699e71

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