Malicious PDF — malware analysis report

Static analysis result for SHA-256 8786b488d9cba9db…

MALICIOUS

PDF

51.0 KB Created: 2020-08-31 00:27:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f14816d08bdd2503c14ada7f7f162410 SHA-1: f5db1453482570e9d1bef5631b4e7e24e5e20041 SHA-256: 8786b488d9cba9db39ecde20b1d5d3692697725e1db326e522f4069c57ed7599
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 external PDF files hosted on Shopify. One of the primary links, 'https://ttraff.ru/wix?keyword=dinamicas+espiritas+de+integra%25C3%25A7%25C3%25A3o', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body itself appears to be a mix of obfuscated text and URLs, suggesting an attempt to manipulate search engine results or 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=dinamicas+espiritas+de+integra%25C3%25A7%25C3%25A3o
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0441/2823/9768/files/project_management_work_breakdown_structure_example.pdf
    • https://cdn.shopify.com/s/files/1/0431/0591/0935/files/commonlit_answers_i_have_a_dream.pdf
    • https://cdn.shopify.com/s/files/1/0437/4216/7194/files/petsafe_in_ground_fence_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/7757/4562/files/the_sacred_mushroom_andrija_puharich.pdf
    • https://static.usrfiles.com/ugd/b8c837_160290fcb9ef44f0a9f514f51c38c8b6.pdf
    • https://static.usrfiles.com/ugd/1cc7e8_5317baee6b4a43d6b71255869966187e.pdf
    • https://static.usrfiles.com/ugd/b8c837_d57a875f48484ecb9c7ba2770793a251.pdf
    • https://static.usrfiles.com/ugd/b8c837_c07415cb6f844e31a99903a4f6f3421f.pdf
    • https://static.usrfiles.com/ugd/db1da1_2be999f8b05d46d7b4435c2eb3c97440.pdf
    • https://static.usrfiles.com/ugd/b8c837_2863a4281c654086a1442c871ca674b3.pdf
    • https://static.usrfiles.com/ugd/b8c837_d8e8d6012ea549288043a7e5f2d85829.pdf
    • https://cdn.shopify.com/s/files/1/0439/2674/9339/files/51993860855.pdf
    • https://cdn.shopify.com/s/files/1/0432/6552/3870/files/augusto_cesar_sandino.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_off000075bf.bin
5c2b71404d55b1a2d0509d202154118638bc2cd0c1c3408be2afc77a5b76d7fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75BF 5648 bytes
font_01_sfnt_off000087f2.bin
b4475491d02a44df607131b2cef5fbeb0df46a6169fc7d75e895f2a761fcc27a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87F2 13568 bytes
font_02_sfnt_off0000af36.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF36 4324 bytes

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