Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3e8a2ee86d7500a…

MALICIOUS

PDF

41.6 KB Created: 2020-08-20 12:56:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 74c9dadbf8c42fdb80cb3be91f005506 SHA-1: 25bb91459ff560b5dfd7df3b602740480dfac3b1 SHA-256: c3e8a2ee86d7500a98a5a0807849496c0280521f5da2d974f494c42ac1f0fa24
160 Risk Score

Malware Insights

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

The PDF file contains a social engineering lure, presenting itself as IELTS speaking test answers to entice users to click a link. This link, 'https://ttraff.ru/pify?keyword=ielts+liz+speaking+part+1+answers', is identified as a malicious redirector. The document also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDF files, likely to manipulate search engine rankings or distribute further malicious content. The primary intent appears to be directing users to malicious infrastructure through a deceptive pretext.

Heuristics 4

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.ru/pify?keyword=ielts+liz+speaking+part+1+answers
    • http://files.dslbeauty.com/uploads/1/3/1/6/131606876/1004.pdf
    • https://cdn.shopify.com/s/files/1/0428/3963/8179/files/59706703224.pdf
    • https://cdn.shopify.com/s/files/1/0433/2909/3784/files/97957292918.pdf
    • https://cdn.shopify.com/s/files/1/0432/2322/0392/files/chrome_os_update.pdf
    • https://cdn.shopify.com/s/files/1/0439/0669/5320/files/61543322774.pdf
    • https://cdn.shopify.com/s/files/1/0435/7141/3160/files/chemistry_all_compound_formula.pdf
    • https://cdn.shopify.com/s/files/1/0438/9902/7611/files/panilisekabeb.pdf
    • https://cdn.shopify.com/s/files/1/0440/6178/6262/files/apocryphal_acts_of_the_apostles.pdf
    • https://cdn.shopify.com/s/files/1/0433/5301/4423/files/divuli.pdf
    • https://cdn.shopify.com/s/files/1/0435/2838/8767/files/ultraviolet_darling_death.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005816.bin
254c0d33787afa118e4b79bf72698cb4b73a6191a575a20c429252a303f29018		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5816 4860 bytes
font_01_sfnt_off000068b5.bin
4c67a45a32aaac9e5d6a50f97a17547bf11f68ce819bb95507ae421e9e9a0fa2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68B5 10312 bytes
font_02_sfnt_off00008bbb.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BBB 4324 bytes

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