Malicious PDF — malware analysis report

Static analysis result for SHA-256 0629eff833175f36…

MALICIOUS

PDF

34.8 KB Created: 2020-08-29 20:17:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2300ffec30bddd57ae1de78dff3dfb8a SHA-1: d57496509f4ad0474a6a8b2ebc55f29fe5927cb3 SHA-256: 0629eff833175f36b3bf805e7167fc758e30d989507e92869097ccc63c209f3b
154 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, also contains URLs pointing to external PDF files, suggesting a link farm or redirection scheme. The ML classifier strongly indicates maliciousness, and the presence of numerous links points towards a tactic to distribute malicious content or manipulate search engine results.

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.cc/wix?keyword=materias+de+quinto+grado+de+primaria+2018
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/2004/1886/files/posuvopimuwenulefaperowa.pdf
    • https://cdn.shopify.com/s/files/1/0434/2710/2887/files/65498813530.pdf
    • https://cdn.shopify.com/s/files/1/0431/5630/8123/files/76704560812.pdf
    • https://cdn.shopify.com/s/files/1/0438/4551/7469/files/62612643092.pdf
    • https://cdn.shopify.com/s/files/1/0434/1386/4602/files/57008152510.pdf
    • https://static.usrfiles.com/ugd/b8c837_50bac93e13434f238ddd3c695c04caea.pdf
    • https://static.usrfiles.com/ugd/b8c837_34bfc55053e041deb60ee9458944597e.pdf
    • https://static.usrfiles.com/ugd/b8c837_1b71d75ab8ef4596b2a344b295b1484e.pdf
    • https://static.usrfiles.com/ugd/b8c837_02be4e9ddc814943ae020a14cdcfa3df.pdf
    • https://static.usrfiles.com/ugd/b8c837_dbfb65b7e1a24f628eca6b1112a25e08.pdf
    • https://static.usrfiles.com/ugd/b8c837_9f19f3f709c24505b265ac7d5dbada1b.pdf
    • https://static.usrfiles.com/ugd/b8c837_410ac11a24bc4a97b1c6fbf94b111d5f.pdf
    • https://cdn.shopify.com/s/files/1/0460/0102/9279/files/badri_film_songs_kannada.pdf
    • https://cdn.shopify.com/s/files/1/0429/6926/8373/files/45148710167.pdf
    • https://cdn.shopify.com/s/files/1/0432/1610/9736/files/aararum_kanathe_malayalam_song.pdf
    • https://cdn.shopify.com/s/files/1/0434/4568/2328/files/grid_template_columns_center.pdf
    • https://cdn.shopify.com/s/files/1/0433/3414/0056/files/christian_album_songs_malayalam.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_off000047a2.bin
3a0108ba1fd7b28436cb5ae9ddebec58294636bd1a3a033b2b0172c88a5073fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x47A2 5900 bytes
font_01_sfnt_off00005b9e.bin
b537df96db2691d0df0e57a0bf455b6d3c7898bc14d9cc4ae30b5aed240ef287		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B9E 10044 bytes

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