Malicious PDF — malware analysis report

Static analysis result for SHA-256 727d50e3b9ccae13…

MALICIOUS

PDF

47.5 KB Created: 2020-08-05 16:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23e0058e862070a58174870145a44af4 SHA-1: 4eee10b5fa6c6afcf16bcedf08224829859b861b SHA-256: 727d50e3b9ccae130d7884f853506ed36249868efde5188d7434e21c92ab65b0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a malicious redirector. The ML classifier strongly indicates maliciousness, and the presence of a link farm suggests an attempt to distribute malicious content or phish users. The document body itself is heavily obfuscated and contains the malicious redirector URL.

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.cc/pify?keyword=familia+berberidaceae+pdf
    • http://files.flixhairandmakeup.co.uk/uploads/1/3/2/6/132681928/jezapuvale_xikezodujav.pdf
    • http://files.ralphjmonroe3.com/uploads/1/3/1/4/131437593/fapisikiwisozeze.pdf
    • http://files.coreyrobinsonmusic.com/uploads/1/3/0/7/130776822/396689.pdf
    • http://files.thesouthernelle.com/uploads/1/3/0/9/130969514/3771504.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/4704/2728/files/36589154773.pdf
    • https://cdn.shopify.com/s/files/1/0429/2732/5343/files/45957200315.pdf
    • https://cdn.shopify.com/s/files/1/0430/3178/9721/files/learn_russian_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0433/5091/7269/files/75662681053.pdf
    • https://cdn.shopify.com/s/files/1/0428/9173/9295/files/movowibijarasosojikedu.pdf
    • https://cdn.shopify.com/s/files/1/0434/2133/5702/files/wixijetavazel.pdf
    • https://cdn.shopify.com/s/files/1/0433/7054/5308/files/sobuwipularapopesamezus.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/72905654063.pdf
    • https://cdn.shopify.com/s/files/1/0434/4119/3127/files/mivaronegebawijepavenel.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/43561311815.pdf
    • https://cdn.shopify.com/s/files/1/0431/8353/8331/files/modern_spanish_grammar_workbook.pdf
    • https://cdn.shopify.com/s/files/1/0434/3260/7894/files/351168111.pdf
    • https://cdn.shopify.com/s/files/1/0432/7990/9028/files/tozogibopelorimuw.pdf
    • https://cdn.shopify.com/s/files/1/0438/8323/3448/files/xewovujadenevixobakewifa.pdf
    • https://cdn.shopify.com/s/files/1/0427/5837/3542/files/lipojimovori.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007d4d.bin
49ba365e062dd06ff8b2e386e417e42656717a053347c31e5dbd6eaa94371e45		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D4D 5216 bytes
font_01_sfnt_off00008eef.bin
6b1ce10bf9630758f0a26eaa864090a23bb460922a46522af303a11626cdd7e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EEF 9908 bytes

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