Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d0d723388e4065a…

MALICIOUS

PDF

49.1 KB Created: 2020-08-20 06:23:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 87bd9038cd36f3e60ecaf9c719f0a347 SHA-1: e2f847a2ecbb5e3af24e11d93f647c895ddd6a3d SHA-256: 0d0d723388e4065a9cd32cd74005f24f515683979c1011cb29f7186cc9fa9c42
154 Risk Score

Malware Insights

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

The PDF contains a link disguised as an exam result checker, which points to a known malicious redirector. The document also hosts a large number of links to other PDFs, likely for SEO manipulation or to obscure the malicious intent. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs supports a phishing or redirection 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=up+board+marksheet+check+online+2017
    • http://baluwewa.alan-pierrebotti.co.uk/uploads/1/3/1/0/131070420/zilobuzo_tupijizaganedi_lakuj_nuxuduxigu.pdf
    • http://files.wakecomedicalalliance.com/uploads/1/3/2/6/132680822/domej.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/4995/1138/files/application_software_list.pdf
    • https://cdn.shopify.com/s/files/1/0427/9821/9420/files/priority_queue_algorithm_in_data_structure.pdf
    • https://cdn.shopify.com/s/files/1/0428/8364/5599/files/marketing_essentials_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0432/0670/5312/files/vepefifaban.pdf
    • https://cdn.shopify.com/s/files/1/0427/9749/8535/files/vuxebopemekufepivos.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3077/files/artesian_hot_tubs.pdf
    • https://cdn.shopify.com/s/files/1/0431/9212/3560/files/jcb_506c_parts.pdf
    • https://cdn.shopify.com/s/files/1/0428/0428/1511/files/20597954338.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/31052941417.pdf
    • https://cdn.shopify.com/s/files/1/0432/6467/1909/files/pikoruvumubelufojojutinil.pdf
    • https://cdn.shopify.com/s/files/1/0428/7909/0855/files/41155898372.pdf
    • https://cdn.shopify.com/s/files/1/0429/9636/7511/files/46778407956.pdf
    • https://cdn.shopify.com/s/files/1/0429/7077/5706/files/87518899681.pdf
    • https://cdn.shopify.com/s/files/1/0428/3963/8179/files/fibonomi.pdf
    • https://cdn.shopify.com/s/files/1/0430/7383/1072/files/xikozo.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a01.bin
666dd6b28db5c3a893d97b2373ac7379a2d51a823a651dffa56901e9aef43234		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A01 5912 bytes
font_01_sfnt_off00007e01.bin
819572540bb880f08de5b422c010c3405090d0b465a226eed859aae495c83b92		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E01 10376 bytes
font_02_sfnt_off0000a1b6.bin
b1615e29a4fe6c7320d553a30418b4fece26933a192be804fa4a6c1955e67a67		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA1B6 16068 bytes

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