Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cb6e8064d638128…

MALICIOUS

PDF

47.8 KB Created: 2020-08-18 17:03:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8d4da50a17336097632d71b59b17933 SHA-1: 7d7e72d9d871f964b878b0eb20c04f7546372f8a SHA-256: 0cb6e8064d6381281903d8a23e1e179bbc39c0c48f10b538995d76eb03f86f08
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to Shopify-hosted PDFs, likely as a tactic to appear legitimate. However, one critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=blokkeren+telefoonnummer+android'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL, suggesting the document's purpose is to redirect users to malicious infrastructure.

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.ru/pify?keyword=blokkeren+telefoonnummer+android
    • http://files.rubinjen.com/uploads/1/3/2/3/132302921/7095533.pdf
    • http://rudet.weitzelfinancial.com/uploads/1/3/1/3/131382406/muviputirulizi.pdf
    • http://fujok.annawitte.org/uploads/1/3/0/9/130969057/cd3126597.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/1267/0111/files/xizeliwe.pdf
    • https://cdn.shopify.com/s/files/1/0446/1517/2259/files/administrao_de_varejo_para_pequenas_e_mdias_empresas.pdf
    • https://cdn.shopify.com/s/files/1/0434/0744/2072/files/math_worksheets_for_preschoolers.pdf
    • https://cdn.shopify.com/s/files/1/0432/5117/1478/files/10794097900.pdf
    • https://cdn.shopify.com/s/files/1/0431/3235/4727/files/bram_stoker_s_dracula_script.pdf
    • https://cdn.shopify.com/s/files/1/0432/4642/0136/files/malos_habitos_alimenticios.pdf
    • https://cdn.shopify.com/s/files/1/0434/9237/6741/files/fjalor_ekonomik_anglisht_shqip.pdf
    • https://cdn.shopify.com/s/files/1/0441/1323/2024/files/navofijikofomekoxesoloj.pdf
    • https://cdn.shopify.com/s/files/1/0435/6079/6318/files/pemolamowi.pdf
    • https://cdn.shopify.com/s/files/1/0431/0879/4525/files/zorejew.pdf
    • https://cdn.shopify.com/s/files/1/0430/5115/5618/files/bonoxubijitun.pdf
    • https://cdn.shopify.com/s/files/1/0438/6055/7984/files/69090481249.pdf
    • https://cdn.shopify.com/s/files/1/0428/9508/1625/files/dinuvokijemujuka.pdf
    • https://cdn.shopify.com/s/files/1/0429/4865/7311/files/8498229961.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f86.bin
091d3781a337de48363d409d4ef79e30645c9c9654fb9b6b3588241e2ee4d404		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F86 4872 bytes
font_01_sfnt_off00007ff3.bin
47fd8311f53a639004cb29f084976113c19391b8dbe8a0a3d11560768a2512a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FF3 10736 bytes
font_02_sfnt_off0000a426.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA426 4324 bytes

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