Malicious PDF — malware analysis report

Static analysis result for SHA-256 62d0f38704468680…

MALICIOUS

PDF

49.8 KB Created: 2020-09-19 03:01:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4e6946768a58946e4ff5d70687de0626 SHA-1: 17e0987217f6eb88457349592d456269eb5855c7 SHA-256: 62d0f387044686802c75da642ec3e0e513a2c1404b0a54258fc0b67029fca1fd
154 Risk Score

Malware Insights

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

The PDF contains a mass of external links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.club/wix?keyword=ap+calculus+bc+partial+fractions+pdf', which is likely intended to trick users into clicking through to a malicious site. The presence of numerous links and the ML classification strongly suggest a malicious intent to redirect users.

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.club/wix?keyword=ap+calculus+bc+partial+fractions+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://db31a3d9-59f8-469c-a636-7aa81c98d42c.filesusr.com/ugd/154db6_4fb8967ad2d14379a59d191a019ddf97.pdf?index=true
    • https://05fab4ec-c5ca-4a37-8458-8e3fbfab650c.filesusr.com/ugd/e4ff69_5af7c1c99260405c9380a3c345b0349d.pdf?index=true
    • https://eb857196-1972-4257-b1c1-0d990d6b6eb8.filesusr.com/ugd/53c654_9f8667c68ea544c1b66ef83b996d575b.pdf?index=true
    • https://9995a58a-f4b1-49d1-9272-70e6ae8c10a6.filesusr.com/ugd/1e533a_a5d5162e42bc4156912d368685e1aea3.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0437/2499/6757/files/90822509151.pdf
    • https://cdn.shopify.com/s/files/1/0430/1606/1091/files/xerostomia_tratamiento.pdf
    • https://cdn.shopify.com/s/files/1/0431/0056/9766/files/graph_quadratic_functions_in_standard_form_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0429/0111/0940/files/14203423211.pdf
    • https://cdn.shopify.com/s/files/1/0432/5385/8472/files/4452861175.pdf
    • https://06fdbf7a-bd85-4d1e-9847-3a83a88b615b.filesusr.com/ugd/008e52_e6d72f8da3eb4529868d29a61f3b4084.pdf?index=true
    • https://a1a7d09e-ee5b-4559-95ee-0f0a032f4ac8.filesusr.com/ugd/b1b16e_3a2e5c400b184d97a7ae1b03d36bf562.pdf?index=true
    • https://c3b78b99-f24f-46b3-ae22-3583381c671b.filesusr.com/ugd/9b5f63_dde63396a30f4320885584261c48fb12.pdf?index=true
    • https://7bff00e8-535b-42c3-850b-7a73e481ae69.filesusr.com/ugd/bbd3cf_86fe5bdd1a9d4ae1b9705623eeedfa55.pdf?index=true
    • https://dce7ba09-aa80-413e-8b8e-eb1bd9b437b8.filesusr.com/ugd/d6af85_ff78844f6dff4c9a9745f30a8b02a70b.pdf?index=true
    • https://acd880ec-4189-47f5-b293-78b3010ccd4a.filesusr.com/ugd/668a47_11a07ceb8b2140a68bf0bad8b2ec6b99.pdf?index=true
    • https://e6d3bf51-130a-4bcf-a02f-bb314a29b3da.filesusr.com/ugd/8b61cf_e3b5368702c14c18b54b05512d7b14cb.pdf?index=true
    • https://a272cbdc-097f-4414-9867-664648d7b2ee.filesusr.com/ugd/3402b1_754b83c21bcf4105a5973d6a219ca84e.pdf?index=true
    • https://96c2616c-e617-40ac-bcc6-75353cb0ecd1.filesusr.com/ugd/784815_de969068625d455da838cd3d18433f0c.pdf?index=true
    • 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_off00007651.bin
9e5d32cdd90f7f09461de674aae4681f5d666e50c3d22c06d1d72ad109d3f12a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7651 5276 bytes
font_01_sfnt_off00008841.bin
1617dbcb1dbda5c6ec837563861bf0cce781f95f1a76d74228c80a87a89f9371		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8841 3924 bytes
font_02_sfnt_off00009616.bin
1235e883fd79906c8e1a8b752ec99e9781f0ca6b04b6c2bd0a2ad2cf6a76794c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9616 10292 bytes

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