Malicious PDF — malware analysis report

Static analysis result for SHA-256 6720d423b05a8b70…

MALICIOUS

PDF

37.0 KB Created: 2020-09-09 04:53:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: bb52c2488565036b2d8f7cbc8c290ac6 SHA-1: 8c0d76c35b8e248d1d7c8a9105a46439ed2f2ea4 SHA-256: 6720d423b05a8b70b5ea8e9885dd05b746dd21ee2b15dc3f8fe116666e6e5f37
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to manipulate search engine results or distribute further content. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a malicious document designed to redirect users to harmful 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.link/pify?keyword=flower+drawing+pictures In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_0c43ab42b40f4f7a892d247be19dfa8a.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/314c35_d0e446a365084b70a7ddde834f7215e3.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/f09a9d_21cd4446b7c748659191507b3db1d493.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/784815_e0ca65cac5f34e1db2c5dbd915a0ac8d.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vebamuwonodivori.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6991/4790/files/povagitugije.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4751/7350/files/32930296958.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2422/0321/files/nogunup.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5197/4818/files/time_value_of_money_full_chapter.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/3786/5637/files/angular_2_search_form_example.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8649/6415/files/autocad_trial_version_2019_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kepikopu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5394 5288 bytes
SHA-256: 66376992e8b0e86427c86dea27d605713b3881b04d8f92b6a0f74d909eca0222
font_01_sfnt_off000065b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65B4 9936 bytes
SHA-256: 90121e3592355c83a5842714a776ad4708fa246615c753e920449b7dbd8bf23b

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