Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceac8c8407e369ee…

MALICIOUS

PDF

43.4 KB Created: 2021-06-03 06:53:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 63fc45f7f9f774c1c376ea89f3e8084f SHA-1: 6cf7756373dea7e7517e85bf65040db421988571 SHA-256: ceac8c8407e369eedc1d8e655c454c545b1820f077ccc48698677da42b1ecc80
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is designed to lure users into clicking links that lead to malicious redirectors and SEO link farms, disguised as game hacks and free currency generators. The document contains numerous links to external PDF files, likely part of a link farm strategy to improve search engine rankings for malicious content. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the lures suggest a phishing or redirection attack.

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/free-coins-app-for-coin-master-game-hack In PDF document text
    • http://psb.sd-alazhar29.sch.id/repository/coin-master-hacks-free-spins_GM406889139.pdfIn PDF document text
    • http://psb.sd-alazhar29.sch.id/repository/hack-master-coin_GM406889139.pdfIn PDF document text
    • http://psb.sd-alazhar29.sch.id/repository/roblox-mobile-hack_GM431946152.pdfIn PDF document text
    • http://psb.sd-alazhar29.sch.id/repository/easy-ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://psb.sd-alazhar29.sch.id/repository/coin-master-free-spins-and-coins-daily_GM406889139.pdfIn PDF document text
    • http://psb.sd-alazhar29.sch.id/repository/coin-master-email-rewards-link_GM406889139.pdfIn PDF document text
    • http://psb.sd-alazhar29.sch.id/repository/get-coin-master-cards-free_GM406889139.pdfIn PDF document text
    • http://psb.sd-alazhar29.sch.id/repository/is-minecraft-vr-free_GM479516143.pdfIn PDF document text
    • http://psb.sd-alazhar29.sch.id/repository/roblox-apk-hack_GM431946152.pdfIn PDF document text
    • http://psb.sd-alazhar29.sch.id/repository/coin-master-free-spins-today-daily-links_GM406889139.pdfIn PDF document text
    • http://psb.sd-alazhar29.sch.id/repository/www-claim-gg-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://psb.sd-alazhar29.sch.id/repository/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://psb.sd-alazhar29.sch.id/repository/free-roblox-toy-codes-not-used_GM431946152.pdfIn PDF document text
    • http://psb.sd-alazhar29.sch.id/repository/roblox-redeem_GM431946152.pdfIn PDF document text
    • http://psb.sd-alazhar29.sch.id/repository/try-minecraft-free_GM479516143.pdfIn PDF document text
    • http://psb.sd-alazhar29.sch.id/repository/minecraft-windows-10-hacked-client_GM479516143.pdfIn PDF document text
    • http://psb.sd-alazhar29.sch.id/repository/coin-master-hacks-for-free-spins_GM406889139.pdfIn PDF document text
    • http://psb.sd-alazhar29.sch.id/repository/free-unlimited-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://psb.sd-alazhar29.sch.id/repository/how-to-hack-coin-master-spin_GM406889139.pdfIn PDF document text
    • http://psb.sd-alazhar29.sch.id/repository/how-to-get-free-robux-without-any-verification_GM431946152.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_off000050b3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50B3 24292 bytes
SHA-256: cba222aac8805263a0c063dd8425b9d05eaa6ad6b01b4ee8cc9179cacfa5b23b
font_01_sfnt_off0000883c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x883C 17884 bytes
SHA-256: 783aaa6655ee4cc9bd4a656e8e37c8d4eb14647635af9e14ecd033d001f0503d

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