Malicious PDF — malware analysis report

Static analysis result for SHA-256 116eb3fb11652057…

MALICIOUS

PDF

44.8 KB Created: 2020-08-30 21:22:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c3438a22c389dcd569ca18efee3203a7 SHA-1: 1434f8f0acb769513888ef203c470b0e443921f7 SHA-256: 116eb3fb116520578d00d01f03768245011b7d9c0fbff4f7bfaa39f00e285ab0
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically the URL https://ttraff.ru/wix?keyword=a%25C5%259Fa%25C4%259F%25C4%25B1dakilerden+hangisi+hizmetlerin. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external links, one of which is https://static.usrfiles.com/ugd/d5d855_647cd9dfcb1e4b798e4d234e75637e77.pdf. 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.ru/wix?keyword=a%25C5%259Fa%25C4%259F%25C4%25B1dakilerden+hangisi+hizmetlerin
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/d5d855_647cd9dfcb1e4b798e4d234e75637e77.pdf
    • https://static.usrfiles.com/ugd/b98abb_ba40f19eea41448791072d37dbe082ec.pdf
    • https://static.usrfiles.com/ugd/04e6f9_18f2467594504c1eb55c2df9705a86b5.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mesujegixaxufusataxa.pdf
    • https://cdn.shopify.com/s/files/1/0435/8638/8123/files/98849479634.pdf
    • https://cdn.shopify.com/s/files/1/0437/2804/4193/files/abdul_kalam_book.pdf
    • https://cdn.shopify.com/s/files/1/0433/7831/1326/files/kissanime._to_animelist.pdf
    • https://cdn.shopify.com/s/files/1/0439/4532/8808/files/second_trust_deed_form_california.pdf
    • https://cdn.shopify.com/s/files/1/0434/5564/3813/files/belgian_railway_map.pdf
    • https://cdn.shopify.com/s/files/1/0431/9700/5981/files/wijipopa.pdf
    • https://cdn.shopify.com/s/files/1/0438/8962/3208/files/aashto_lrfd_bridge_design_specifications_8th_edition.pdf
    • https://static.usrfiles.com/ugd/b8c837_2dc492b0b03549709b0c968f3d0f165c.pdf
    • https://static.usrfiles.com/ugd/ae059d_b8667e9b2dc74e8191d6f2a3b637a674.pdf
    • https://static.usrfiles.com/ugd/4826f5_b9d793d35ea943e0bbf96954179c1e26.pdf
    • https://static.usrfiles.com/ugd/b8c837_5a24bd9f1bc7496996d93b0c6e9612e2.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_off00006e29.bin
182efb97dbd8dd289edda3d99b5132ce34bf282c4c9a9a3f99c5b93534a28640		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E29 5852 bytes
font_01_sfnt_off000080f2.bin
914fb499bd675f3a40ec05cb65fb287e66121f15965b87037e7b2b21a4f642cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80F2 11412 bytes

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