Malicious PDF — malware analysis report

Static analysis result for SHA-256 64b6ab54ee766756…

MALICIOUS

PDF

51.1 KB Created: 2020-08-22 21:33:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f215b109e3bd8c25a4fc5ef2988fb32 SHA-1: 2946818c3048bf7e09ac7cce183e568bed38d280 SHA-256: 64b6ab54ee766756724cb1aa0332d1420012e4abb10eef827daea5da08854beb
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with the primary URL identified as a malicious redirector. The document body, though heavily obfuscated, contains references to URLs and appears to be a link farm designed to manipulate search engine results or distribute malware. The ML classifier 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.ru/pify?keyword=jasoda+sarkar+new+baul+song
    • http://files.oddsockscandles.co.nz/uploads/1/3/2/7/132740234/1798037.pdf
    • http://files.revlindasings.com/uploads/1/3/1/3/131384573/xumis.pdf
    • http://zulax.cindycheng.works/uploads/1/3/1/4/131406717/porifamowu_wuxevu.pdf
    • http://files.asfi2020.com/uploads/1/3/1/4/131453455/tixixim_vumibif_malisisobes.pdf
    • http://files.planninginblackandwhite.com/uploads/1/3/2/7/132710655/bobuzugipiz_renele_litazafurusagop.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5113/0785/files/35212088752.pdf
    • https://cdn.shopify.com/s/files/1/0454/4944/5526/files/paroriduzerokapaxesarul.pdf
    • https://cdn.shopify.com/s/files/1/0433/9456/4252/files/caremark_prior_authorization_form_for_adderall.pdf
    • https://cdn.shopify.com/s/files/1/0431/9612/1248/files/pefudagirulidefolojivasab.pdf
    • https://cdn.shopify.com/s/files/1/0432/0660/7012/files/dapereda.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tokisesuzarutaxiwiru.pdf
    • https://cdn.shopify.com/s/files/1/0430/8179/3698/files/effective_email_writing_skills_free.pdf
    • https://cdn.shopify.com/s/files/1/0436/1709/1744/files/fovasitirilowadifejibun.pdf
    • https://cdn.shopify.com/s/files/1/0431/1613/4551/files/sadiruwu.pdf
    • https://cdn.shopify.com/s/files/1/0432/7204/4697/files/milan_italy_map.pdf
    • https://cdn.shopify.com/s/files/1/0437/8561/7566/files/brownian_motion_and_diffusion_freedman.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_off00007e3c.bin
7975d94332996e20c3e35cee74c8a4de9de4743f2f6459062e2ee8051d827676		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E3C 5276 bytes
font_01_sfnt_off0000904b.bin
528b5718e5c08ce06a598b78cfd3c0f2f5299b53d6615ee434043d9208845641		 pdf-font-stream PDF embedded font (sfnt) at offset 0x904B 14748 bytes

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