Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aea0ddff398619c…

MALICIOUS

PDF

48.6 KB Created: 2020-09-06 10:03:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21af88ad396533a8141d4e5355fc9634 SHA-1: bc267797bedf561e5397a3a5364ec6f57b405c56 SHA-256: 2aea0ddff398619cd7e0a85a1d7270027952ddc60da6099cd4e7f536344914f1
154 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, ttraff.me, disguised as a brochure template. This redirector likely leads to further malicious content or exploits. The presence of a large number of external PDF links, many pointing to static.usrfiles.com, suggests a link farm or SEO poisoning attempt to drive traffic to the malicious redirector. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.me/pify?keyword=tri+fold+brochure+mockup+psd+template
    • https://static.usrfiles.com/ugd/822ecd_469e7760a4a8489896eeb9f1b8cc70ee.pdf
    • https://static.usrfiles.com/ugd/8acad3_a10b3a90f56642c2b08e275ddc57cd5d.pdf
    • https://static.usrfiles.com/ugd/dad7b5_d7a5e91489784c449ddaeea252386fd2.pdf
    • https://static.usrfiles.com/ugd/b8c837_5c5ac4928c234d3faed32a9588b7a399.pdf
    • https://static.usrfiles.com/ugd/866690_27de5c68447c4d1f95d83bb4009fc234.pdf
    • https://static.usrfiles.com/ugd/6908d7_cd53f6aac6734a99bb8ceb3114e4c12f.pdf
    • https://static.usrfiles.com/ugd/97368a_c9e408647bf34d94a8bd5588c167b28f.pdf
    • https://static.usrfiles.com/ugd/7c1f05_db777709f7724a47a299ae0cb859fc5f.pdf
    • https://static.usrfiles.com/ugd/a8ca0f_bea709e5ff38408ea94439363343a2fd.pdf
    • https://cdn.shopify.com/s/files/1/0429/2775/1321/files/ignou_ba_sociology_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0430/0318/3258/files/kerala_university_bsc_chemistry_syllabus_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/7650/9080/files/pdf_to_word_download_app.pdf
    • https://cdn.shopify.com/s/files/1/0432/4337/2699/files/cantigas_de_roda_letras.pdf
    • https://cdn.shopify.com/s/files/1/0441/0766/1464/files/mabewuvupujazolexatudu.pdf
    • https://cdn.shopify.com/s/files/1/0438/3840/6806/files/wedding_decoration_business_plan.pdf
    • https://cdn.shopify.com/s/files/1/0430/1206/3391/files/a_noite_dos_mortos_vivos_livro_pdf.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_off000080a5.bin
339abe16cbb2a04f3d5be747e9272ddbe48a015c25f06826fdf41bfc0d16c35c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80A5 5548 bytes
font_01_sfnt_off0000934c.bin
f5ca2e56cddb72b8387850437194290e9c872deaab063b1b4a7834fb47d7deb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x934C 10072 bytes

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