Malicious PDF — malware analysis report

Static analysis result for SHA-256 727baaed9753ffa1…

MALICIOUS

PDF

71.6 KB Created: 2020-08-30 08:39:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b8b2c4868a1f24c49872a78a9203a824 SHA-1: 2deabbd41fc569e558f3aaac79145e1dab2a888d SHA-256: 727baaed9753ffa108a80ddfac26d3c4e88d3a734d1ae8c0f2e7acaa84734ab7
154 Risk Score

Malware Insights

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

The PDF file was identified as malicious by an ML classifier and contains a critical heuristic firing for linking to known malicious redirector infrastructure. It also exhibits characteristics of a PDF link farm, with numerous external links, one of which points to a potentially malicious URL. While no scripts were extracted, the embedded URLs and the nature of the link farm suggest an attempt to lure users to malicious sites.

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=audition+vietnam+game
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_40427c1de91b472eb12c545b3c415cf4.pdf
    • https://static.usrfiles.com/ugd/b8c837_31acf244f30c48d9ba84016a7ceea100.pdf
    • https://static.usrfiles.com/ugd/39cb9d_2b4eb3ee96ed4c31a226791e39ff20c0.pdf
    • https://static.usrfiles.com/ugd/df4650_340be7863b154cc090a3acb87f7929b3.pdf
    • https://static.usrfiles.com/ugd/4b68be_71ed658141904a2ca0f155397bb6af85.pdf
    • https://static.usrfiles.com/ugd/b8c837_e3438c9ce42e43fda0f973d6262c13d3.pdf
    • https://static.usrfiles.com/ugd/0df15e_b1360f35772c43ef97ef79587b543bc9.pdf
    • https://static.usrfiles.com/ugd/b8c837_c0fd3d5e8dfe4ebe9a91378ca8115012.pdf
    • https://cdn.shopify.com/s/files/1/0434/1484/7655/files/astm_testing_standards.pdf
    • https://cdn.shopify.com/s/files/1/0439/0413/9416/files/aurore_x_chevalier.pdf
    • https://cdn.shopify.com/s/files/1/0431/5702/9019/files/liverpool_fc_match_report.pdf
    • https://cdn.shopify.com/s/files/1/0448/4094/3778/files/converter_to_word_editable.pdf
    • https://static.usrfiles.com/ugd/61b8bf_6d571f6151eb41ce97d974f89b793411.pdf
    • https://static.usrfiles.com/ugd/3f0e57_9d6e96efa3d94d3db5fe384dfc523052.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_off0000a54e.bin
6a920db66ace8faea54db5ab9e3428c847b9d578b938c67b15ceae4455f65952		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA54E 14856 bytes
font_01_sfnt_off0000d5a5.bin
46b97ac126a8180f32b8624f1e25042e18d7f8fdc8ca3e2b59140f2a3755637d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A5 4888 bytes
font_02_sfnt_off0000e636.bin
a5eb0ca1f45af04fa672945e23c9ae18ca8e9859c5df5c74573cf97b39df3c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE636 15084 bytes

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