Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2323c774363dc0f…

MALICIOUS

PDF

42.7 KB Created: 2021-05-15 08:02:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 16efb73f012e17fd2b47fa854df1cb56 SHA-1: 871bba388d5aa70fb49b2b3b5883f93126cdce88 SHA-256: e2323c774363dc0f99f2f17f02b8d7307bbefbd07a29278c306f28c2620a9479
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links designed to lure users to external sites, masquerading as generators for game hacks and free currency. One primary URL, 'https://netcdn.xyz/app/406889139/free-spins-and-coins-coin-master-app-game-hack', is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to game hacks and generators, reinforcing the lure. The presence of numerous external PDF links suggests a link farm or SEO manipulation tactic to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/406889139/free-spins-and-coins-coin-master-app-game-hack In PDF document text
    • http://prodent.com.ua/images/free-roblox-accounts-with-builders-club_GM431946152.pdfIn PDF document text
    • http://prodent.com.ua/images/coin-master-free-spinv1-0apkpure-com-apk_GM406889139.pdfIn PDF document text
    • http://prodent.com.ua/images/roblox-lawsuit_GM431946152.pdfIn PDF document text
    • http://prodent.com.ua/images/best-free-spin-app-for-coin-master_GM406889139.pdfIn PDF document text
    • http://prodent.com.ua/images/mangocheats-com-hack-coin-master-cheat_GM406889139.pdfIn PDF document text
    • http://prodent.com.ua/images/ultimate-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://prodent.com.ua/images/free-coin-master-spins-blogger_GM406889139.pdfIn PDF document text
    • http://prodent.com.ua/images/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • http://prodent.com.ua/images/coin-master-free-spins-ios-2021_GM406889139.pdfIn PDF document text
    • http://prodent.com.ua/images/how-to-get-more-robux-for-free_GM431946152.pdfIn PDF document text
    • http://prodent.com.ua/images/how-to-hack-roblox-passwords_GM431946152.pdfIn PDF document text
    • http://prodent.com.ua/images/i-didnt-get-my-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://prodent.com.ua/images/gain-robux_GM431946152.pdfIn PDF document text
    • http://prodent.com.ua/images/free-daily-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • http://prodent.com.ua/images/free-robux-real-working_GM431946152.pdfIn PDF document text
    • http://prodent.com.ua/images/free-robux-com-2021_GM431946152.pdfIn PDF document text
    • http://prodent.com.ua/images/earn-robux-now_GM431946152.pdfIn PDF document text
    • http://prodent.com.ua/images/coin-master-exchange-40-free-spins_GM406889139.pdfIn PDF document text
    • http://prodent.com.ua/images/master-coins-free_GM406889139.pdfIn PDF document text
    • http://prodent.com.ua/images/free-minecraft-accounts-reddit_GM479516143.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
font_00_sfnt_off00004c4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4C4B 25116 bytes
SHA-256: 1633f4e92faaf00a1c5805e9839c130af7e110265f37c4c22b36844bb8632056
font_01_sfnt_off0000855e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x855E 18060 bytes
SHA-256: d4954d2d00bde9f6a1061857a61d2c62c1ae360f44744af150ee923481526d51

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