Malicious PDF — malware analysis report

Static analysis result for SHA-256 551629ac08ad6de8…

MALICIOUS

PDF

35.4 KB Created: 2020-09-06 17:46:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 85ef1e959bf67490a0ef96d02c574a3d SHA-1: e2b5ff77754d9ca942d71be8e971c5fd10aeeb1e SHA-256: 551629ac08ad6de87c8399fbf65dfb33e8308f34dc0560540369fcf159d87319
120 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, specifically `https://ttraff.link/wix?keyword=berlitz+english+language+books+free`. This indicates the document's primary purpose is to redirect users to malicious infrastructure. The presence of a large number of external PDF links, many hosted on `static.usrfiles.com`, suggests a link farm or SEO poisoning tactic to increase visibility and lure unsuspecting users. The document body, though heavily corrupted, contains fragments of the lure text and the malicious URL.

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.link/wix?keyword=berlitz+english+language+books+free
    • https://static.usrfiles.com/ugd/b8c837_822f31ee723b42e396225a7d915ab1c8.pdf
    • https://static.usrfiles.com/ugd/ea2f88_2c68932a4d1141f2abba5cb24d9694d6.pdf
    • https://static.usrfiles.com/ugd/0779a3_af31765e784541319b77f48c2f3c1fda.pdf
    • https://static.usrfiles.com/ugd/6e3131_e44b6e57495a46748a951404b27f8b2b.pdf
    • https://static.usrfiles.com/ugd/0ebc1f_81d70caba24b4855b18d34afba514dc2.pdf
    • https://static.usrfiles.com/ugd/5360f8_cc8118b48b854b628136310b19a994be.pdf
    • https://static.usrfiles.com/ugd/d7ba0f_9d84b7336e8b47dd823bcd1d6a814f22.pdf
    • https://static.usrfiles.com/ugd/a01749_5d613cb7487743ffb7086fc361d5641e.pdf
    • https://cdn.shopify.com/s/files/1/0428/9334/4924/files/shakespearean_sonnet_structure.pdf
    • https://cdn.shopify.com/s/files/1/0448/3055/6320/files/xoruron.pdf
    • https://cdn.shopify.com/s/files/1/0440/7017/4870/files/baringo_county_bursary_form.pdf
    • https://static.usrfiles.com/ugd/8acad3_d5992128a56742c987e2f075db0a85f9.pdf
    • https://static.usrfiles.com/ugd/fac845_36065bc792784362adfc705d77aadf92.pdf
    • https://static.usrfiles.com/ugd/b8c837_48e37fcc113c452f908e00b5c7180b52.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_off00004d1a.bin
036313d680afca04b369c6ae8fd4526194c73f1ff762bb196c2307f56eba3edd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D1A 5332 bytes
font_01_sfnt_off00005f45.bin
51dcf015edfc329d0d1eafe704c8d7e4461f17c6fe39aed3b296c9ee1b41d675		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F45 9700 bytes

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