Malicious PDF — malware analysis report

Static analysis result for SHA-256 620b977a6eeade59…

MALICIOUS

PDF

42.4 KB Created: 2021-06-04 03:50:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 0c21d5e4ed61636a9fd0acaba7bbc588 SHA-1: acd55fdb52c63d4c3e8e4c2bb82f599425688604 SHA-256: 620b977a6eeade59ef896a1dd0960bc7672e702945778862b644c5cbfe5646e7
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links designed to lure users into clicking on them, promising free game currency or hacks. These links redirect to malicious infrastructure, including a known redirector and a large number of SEO-optimized PDF links hosted on lib.vipklh.ru. The document body and heuristics indicate a clear intent to drive traffic to these malicious sites, likely as part of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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/835599320/free-tiktok-coins-game-hack In PDF document text
    • http://lib.vipklh.ru/repository/minecraft-pc-download-free-full-version_GM479516143.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-free-coins-hack_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/is-minecraft-free-on-xbox_GM479516143.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-coin-link_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/plug-toolbox-for-minecraft-free-ios_GM479516143.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-get-free-robux-for-free_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/robux-download_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-spins-on-coin-master-link_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/xray-mod-minecraft-114_GM479516143.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-get-free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/roblox-redeem-card-codes-free_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-robux-with-no-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-do-you-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-minecraft-survival-server_GM479516143.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-get-free-robux-inspect_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/is-coin-master-hack-safe_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_off00004ae9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AE9 25744 bytes
SHA-256: 31083804ee1bfe682aec0da70d8df9c8c1155d033651f23dc9015c0e74a6a84d
font_01_sfnt_off0000856c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x856C 17456 bytes
SHA-256: af63c3f67091ff5b4163c7a95634870b81efad78e40c2266e63b82bf422718e0

Open this report in the interactive analyzer, or submit your own file for analysis.