Malicious PDF — malware analysis report

Static analysis result for SHA-256 af9aa70a401275e3…

MALICIOUS

PDF

35.5 KB Created: 2021-06-25 17:16:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 7dea2b909a37ab68613bb67e98cd03c5 SHA-1: 4104a3c7fa78a2285e94bdc003376c3be819bdcf SHA-256: af9aa70a401275e39a0197f90d18ac188ad88188857c123dd404f78bd6b7a61f
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links designed to lure users into clicking on them by promising free game-related items. These links point to redirector infrastructure and a large number of SEO-optimized PDF files, indicating a link farm designed to drive traffic to potentially malicious sites. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/stickmasterluke-free-robux-obby-link-game-hack In PDF document text
    • http://lawpatron.ru/images/how-to-get-100-robux-for-free_GM431946152.pdfIn PDF document text
    • http://lawpatron.ru/images/how-to-make-clothes-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://lawpatron.ru/images/minecraft-nintendo-switch-digital-code-free_GM479516143.pdfIn PDF document text
    • http://lawpatron.ru/images/coin-master-hacks-for-iphone_GM406889139.pdfIn PDF document text
    • http://lawpatron.ru/images/free-robux-2021-no-verification_GM431946152.pdfIn PDF document text
    • http://lawpatron.ru/images/how-to-get-free-robux-ios-and-pc-october_GM431946152.pdfIn PDF document text
    • http://lawpatron.ru/images/minecraft-server-hacks_GM479516143.pdfIn PDF document text
    • http://lawpatron.ru/images/games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://lawpatron.ru/images/how-to-get-free-gold-cards-on-coin-master_GM406889139.pdfIn PDF document text
    • http://lawpatron.ru/images/hack-all-game-roblox_GM431946152.pdfIn PDF document text
    • http://lawpatron.ru/images/free-scpf-site-roblox_GM431946152.pdfIn PDF document text
    • http://lawpatron.ru/images/hack-murder-mystery-roblox-to-download-free_GM431946152.pdfIn PDF document text
    • http://lawpatron.ru/images/coin-master-link-daily-get-free-spins-amp_GM406889139.pdfIn PDF document text
    • http://lawpatron.ru/images/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://lawpatron.ru/images/how-to-get-minecraft-windows-10-edition-for-free_GM479516143.pdfIn PDF document text
    • http://lawpatron.ru/images/free-robux-website-not-a-scam-or-fake_GM431946152.pdfIn PDF document text
    • http://lawpatron.ru/images/pubg-70-uc_GM1330123889.pdfIn PDF document text
    • http://lawpatron.ru/images/can-you-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lawpatron.ru/images/free-robux-for-obby_GM431946152.pdfIn PDF document text
    • http://lawpatron.ru/images/coin-master-daily-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3170 22748 bytes
SHA-256: ae08de8571379e07712aee6979500bd11f60bc2cb0ce32ee2ca8bc965ea34729
font_01_sfnt_off0000642f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x642F 19624 bytes
SHA-256: cd66c85a718750c01e08a2c8fc962f4311f1ae0651eb7e6c81faf4714739338c

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