Malicious PDF — malware analysis report

Static analysis result for SHA-256 13b9007ceab01505…

MALICIOUS

PDF

39.6 KB Created: 2020-08-06 22:45:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ba25cd673a8d2b9a1f8d9a4a37a53b5 SHA-1: 60dfc018a2d218dcbc6f363e05e4c72eb2315a7b SHA-256: 13b9007ceab01505b1a2129fd67e9cc07e9179840cd9fe62f20968f2a0b62c56
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'Calendario 2020' and the malicious URL, suggesting a lure to a link farm or phishing site. The ML classifier strongly indicated maliciousness, and the presence of a redirector link points to a likely attempt to lead the user to a harmful destination.

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=calendario+2020+escolar+2020+sep+195+dias+pdf
    • http://files.fatherheart.me/uploads/1/3/1/4/131437632/5991763.pdf
    • http://files.love2meditate.com/uploads/1/3/1/4/131452922/pilusitugil-dilekutufojidiv.pdf
    • http://files.zumbawithmelody.com/uploads/1/3/1/6/131606546/6701429.pdf
    • http://files.cofchristslc.org/uploads/1/3/2/6/132695636/kezowinajotu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/0609/8597/files/xutalimumol.pdf
    • https://cdn.shopify.com/s/files/1/0433/5229/3541/files/boxamosexopuletixugaw.pdf
    • https://cdn.shopify.com/s/files/1/0429/8774/9529/files/diforake.pdf
    • https://cdn.shopify.com/s/files/1/0436/2846/2233/files/5756966924.pdf
    • https://cdn.shopify.com/s/files/1/0429/1851/0745/files/20082995954.pdf
    • https://cdn.shopify.com/s/files/1/0439/4542/7102/files/2497669038.pdf
    • https://cdn.shopify.com/s/files/1/0434/1579/7917/files/39517085409.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/27482348981.pdf
    • https://cdn.shopify.com/s/files/1/0428/5507/1900/files/bmat_test.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/90554838216.pdf
    • https://cdn.shopify.com/s/files/1/0432/0722/9597/files/92951985009.pdf
    • https://cdn.shopify.com/s/files/1/0434/4256/9368/files/bogudijotaduwajujuwebuj.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/25668779603.pdf
    • https://cdn.shopify.com/s/files/1/0427/8996/1884/files/xibadusogoterigemubij.pdf
    • https://cdn.shopify.com/s/files/1/0434/5020/4327/files/43462001496.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_off00005714.bin
70d64b3fbe668a0ac0c524fc146db2bc5a54105eec540e380493ebaf6f1044e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5714 5660 bytes
font_01_sfnt_off00006a69.bin
1bed37042312f38b7143b7e2f00dd47a6336fc744bc449c143d10cfe0cc107ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A69 11404 bytes

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