Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec53de9c6fc2b5e2…

MALICIOUS

PDF

43.7 KB Created: 2021-06-03 07:27:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 079880f565e25927fa1e3757ea89df35 SHA-1: 1d9ff3a97f5ad27c0fd16de79d28f7c610e2404b SHA-256: ec53de9c6fc2b5e2716622e810e8068661a34e4b6f2537cd586f67010a962fe0
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to known malicious redirectors and a link farm, suggesting a phishing or scam attempt. The primary lure appears to be related to 'game hacks' and 'free generators', aiming to trick users into visiting the malicious URLs. No scripts were extracted, but the presence of numerous external links and the ML classifier's high confidence indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/coin-master-game-hack-link-game-hack In PDF document text
    • http://perpus.poltekkes-tanjungpinang.ac.id/repository/how-to-get-free-robux-in-2021_GM431946152.pdfIn PDF document text
    • http://perpus.poltekkes-tanjungpinang.ac.id//repository/free-spins-coin-master-daily_GM406889139.pdfIn PDF document text
    • http://perpus.poltekkes-tanjungpinang.ac.id//repository/coinmaster-com_GM406889139.pdfIn PDF document text
    • http://perpus.poltekkes-tanjungpinang.ac.id/repository/coin-master-cheats-free-spins_GM406889139.pdfIn PDF document text
    • http://perpus.poltekkes-tanjungpinang.ac.id/repository/coin-master-hack-apk-app_GM406889139.pdfIn PDF document text
    • http://perpus.poltekkes-tanjungpinang.ac.id//repository/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://perpus.poltekkes-tanjungpinang.ac.id//repository/coin-master-daily-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • http://perpus.poltekkes-tanjungpinang.ac.id/repository/free-coins-for-flip-master-online_GM406889139.pdfIn PDF document text
    • http://perpus.poltekkes-tanjungpinang.ac.id//repository/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://perpus.poltekkes-tanjungpinang.ac.id/repository/coin-master-free-spins-and-coins-without-human-verification_GM406889139.pdfIn PDF document text
    • http://perpus.poltekkes-tanjungpinang.ac.id/repository/free-spins-and-coins-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://perpus.poltekkes-tanjungpinang.ac.id/repository/coin-master-hacker-club_GM406889139.pdfIn PDF document text
    • http://perpus.poltekkes-tanjungpinang.ac.id//repository/robux-hack-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.poltekkes-tanjungpinang.ac.id//repository/google-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://perpus.poltekkes-tanjungpinang.ac.id//repository/coin-master-hack-online-without-human-verification_GM406889139.pdfIn PDF document text
    • http://perpus.poltekkes-tanjungpinang.ac.id/repository/www-coin-master-hack-xyz_GM406889139.pdfIn PDF document text
    • http://perpus.poltekkes-tanjungpinang.ac.id//repository/free-roblox-website_GM431946152.pdfIn PDF document text
    • http://perpus.poltekkes-tanjungpinang.ac.id/repository/roblox-hack_GM431946152.pdfIn PDF document text
    • http://perpus.poltekkes-tanjungpinang.ac.id/repository/unlimited-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.poltekkes-tanjungpinang.ac.id/repository/coin-master-free-spin-now_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005241.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5241 24248 bytes
SHA-256: 39311240265314395cc7079afdc21fb55c922ef3d446ff9331f38055b187943c
font_01_sfnt_off00008941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8941 17976 bytes
SHA-256: 4c1d26c1fb4feed8092d99a8761960172faa49b0c213e7324f16c91828cd6f14

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