Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c2809c058f55b11…

MALICIOUS

PDF

38.3 KB Created: 2020-08-12 05:07:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e335076b7ec549f0770ccb188aa0cfe6 SHA-1: 445ca3a975cf3cb56dbdb2111e8b61313bbdbc48 SHA-256: 0c2809c058f55b119097b0a0bd98d7ef05546f0e999c64fefa55be4928cb61d8
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 potentially malicious redirectors or link farms. The primary malicious URL identified is ttraff.ru, which is known to host redirectors. The document body, though heavily obfuscated, contains the target URL, suggesting an attempt to trick users into clicking malicious links under the guise of a budget document. No scripts were extracted, but the presence of numerous external links indicates a redirection-based attack.

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=budget+2020+20+in+marathi+pdf
    • http://nakoxur.umecu-urbana.com/uploads/1/3/2/6/132696194/9025025.pdf
    • http://files.gregstensonwriter.com/uploads/1/3/2/6/132681153/vorupife-jeralafofi.pdf
    • http://files.northwesternbreastsurgeons.com/uploads/1/3/0/8/130873958/3106833.pdf
    • http://files.moneyforpropertydamage.com/uploads/1/3/0/7/130739069/6566049.pdf
    • http://midim.14thstreetartistcommunity.com/uploads/1/3/0/7/130739664/vajenod-zafaxawexewu-jekebabiz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/3529/5905/files/xinolusejat.pdf
    • https://cdn.shopify.com/s/files/1/0433/7424/8101/files/57245697281.pdf
    • https://cdn.shopify.com/s/files/1/0438/2952/6688/files/74414806544.pdf
    • https://cdn.shopify.com/s/files/1/0432/1997/6350/files/jaxunaxujadetivaket.pdf
    • https://cdn.shopify.com/s/files/1/0435/5286/6463/files/gate_2020_information_brochure_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/6467/1906/files/managerial_economics_samuelson.pdf
    • https://cdn.shopify.com/s/files/1/0435/1547/8176/files/waganojimizesewirivij.pdf
    • https://cdn.shopify.com/s/files/1/0447/3402/1788/files/arrancame_la_vida_libro.pdf
    • https://cdn.shopify.com/s/files/1/0433/3669/5959/files/past_simple_and_past_continuous_worksheets_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/6315/6641/files/faux_calligraphy_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0439/1567/3752/files/github_reset_local_to_match_remote.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_off00005689.bin
6e0bda276becae11c245ca603b1258139e23c33768667bbf1acb812f43decc6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5689 5568 bytes
font_01_sfnt_off0000694a.bin
fed827c3edd0874df1c261f737139cd5585c6567394feb2b75276c2ff4580a8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x694A 10208 bytes

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