Malicious PDF — malware analysis report

Static analysis result for SHA-256 c31f0c3c583ca669…

MALICIOUS

PDF

41.6 KB Created: 2020-09-02 19:43:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf0b88d8102514082f4ac249eca960e6 SHA-1: 58bc9aed24475372e946822a56d8ed9e4821d059 SHA-256: c31f0c3c583ca66952ee806cb5d835b062a6626d2b17c86e024d1b84e9467c33
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a clear lure promising a free Windows 7 activation key, directly linked to a malicious redirector URL. The heuristic firings confirm the presence of malicious redirector links and a large number of external PDF links, suggesting a link farm designed to distribute malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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://ttraff.club/pify?keyword=windows+7+activate+key+free
    • https://cdn.shopify.com/s/files/1/0431/6377/9221/files/celestial_coordinate_system.pdf
    • https://cdn.shopify.com/s/files/1/0433/4141/4552/files/9425029902.pdf
    • https://cdn.shopify.com/s/files/1/0430/5331/8306/files/vagutuparowojotumageze.pdf
    • https://static.usrfiles.com/ugd/3eed2b_b58fafa92c0c4f799e839f37fb23b0eb.pdf
    • https://static.usrfiles.com/ugd/b8c837_912569e4c4bb43e8b098a71aeca5d8d9.pdf
    • https://static.usrfiles.com/ugd/5e81b9_bb4b6fcb1c964372953334bb2313ea91.pdf
    • https://static.usrfiles.com/ugd/03ae60_c77c4fc948dc4d9d8c70dc80a9f21dfd.pdf
    • https://cdn.shopify.com/s/files/1/0430/5407/1957/files/mopubabupesazuna.pdf
    • https://cdn.shopify.com/s/files/1/0430/9372/1255/files/3d_sky_bedsheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/8212/9320/files/avast_cleanup_cracked_apk.pdf
    • https://cdn.shopify.com/s/files/1/0437/7640/9751/files/carmina_burana_codex.pdf
    • https://cdn.shopify.com/s/files/1/0462/4944/3482/files/betodememijiwugixivi.pdf
    • https://cdn.shopify.com/s/files/1/0432/2649/7182/files/zolefipilutawu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0173/2520/files/82852531040.pdf
    • https://cdn.shopify.com/s/files/1/0435/6934/8763/files/vilabegabidulurobororo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006473.bin
6d48b34e3d92979952a59ce47b79a088604e8284988cdde0bca58f8ae9b78b2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6473 5392 bytes
font_01_sfnt_off0000770c.bin
9cf0d13a9c02206fd191d59878eca5edfaa86128cf16f9aa01fa6e1c75f9f410		 pdf-font-stream PDF embedded font (sfnt) at offset 0x770C 10128 bytes

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