Malicious PDF — malware analysis report

Static analysis result for SHA-256 3614ffa57b2541da…

MALICIOUS

PDF

42.8 KB Created: 2021-05-12 18:42:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: e2c4853e64ec71922698931df446d7d5 SHA-1: 8d4510c12b5e6f002b60bd769a82ffb1065df068 SHA-256: 3614ffa57b2541da1d638891682d3c122a7b8fa05520a8cb5ffa6f54d7661255
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links designed to lure users to external sites, including a known malicious redirector. The document body and embedded links promote 'free Robux' and game hacks, indicating a phishing or scam attempt. The presence of multiple PDF links suggests a link farm used for SEO manipulation or to distribute further malicious content.

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/431946152/free-robux-without-human-verification-game-hack In PDF document text
    • http://repository.poliven.ac.id//repository/best-way-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://repository.poliven.ac.id/repository/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://repository.poliven.ac.id/repository/coin-master-daily-free-spins-link-today-haktuts_GM406889139.pdfIn PDF document text
    • http://repository.poliven.ac.id/repository/coin-master-free-spins-link-download-apk_GM406889139.pdfIn PDF document text
    • http://repository.poliven.ac.id//repository/1x1x1x1-roblox-id_GM431946152.pdfIn PDF document text
    • http://repository.poliven.ac.id//repository/free-spin-coin-master-twitter_GM406889139.pdfIn PDF document text
    • http://repository.poliven.ac.id//repository/free-robux-no-human-verification-generator_GM431946152.pdfIn PDF document text
    • http://repository.poliven.ac.id//repository/202100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://repository.poliven.ac.id//repository/spins-gratis-coin-master-hoy_GM406889139.pdfIn PDF document text
    • http://repository.poliven.ac.id//repository/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://repository.poliven.ac.id/repository/how-to-get-free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • http://repository.poliven.ac.id//repository/fighting-free-card-coin-master_GM406889139.pdfIn PDF document text
    • http://repository.poliven.ac.id//repository/free-robux-that-actually-works-2021_GM431946152.pdfIn PDF document text
    • http://repository.poliven.ac.id/repository/claimrobux-net_GM431946152.pdfIn PDF document text
    • http://repository.poliven.ac.id//repository/roblox-hack-tool_GM431946152.pdfIn PDF document text
    • http://repository.poliven.ac.id/repository/how-to-install-minecraft-for-free-on-ios_GM479516143.pdfIn PDF document text
    • http://repository.poliven.ac.id/repository/how-to-get-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://repository.poliven.ac.id//repository/free-coin-master-hacks-no-verification-or-survey_GM406889139.pdfIn PDF document text
    • http://repository.poliven.ac.id//repository/coin-master-cards-free-cards_GM406889139.pdfIn PDF document text
    • http://repository.poliven.ac.id/repository/inappropriate-roblox-games-2021_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_003_off000048fa.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48FA 24844 bytes
SHA-256: dbe3af92808de67ce91147693cf22ea2375376031d578bde5362462357cbb352
font_01_sfnt_off00008232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8232 19224 bytes
SHA-256: 69162c0303826e3a88150cee7b6b12b50ba56e04bc46253c0e5eb9f80ac8a399

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