Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e049e31d38360e4…

MALICIOUS

PDF

57.0 KB Created: 2020-07-23 05:52:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb5e61822f1999bf6043ce60e521a6a0 SHA-1: 45de28e40e0160a54a3a1a61dc26e03915c0c177 SHA-256: 0e049e31d38360e4dae6cb6180e68c5d6bf83c158725f08c9a5f3e1c4396d6e5
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to known malicious redirector infrastructure (ttraff.ru). The document body, though heavily obfuscated, suggests a lure related to 'probability practice answers'. The ML classifier strongly flagged this PDF as malicious, indicating it's designed to lead users to harmful content. No scripts were extracted, but the presence of external links and the ML detection suggest a phishing or content-luring 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/wb?keyword=beyond%20the%20worksheet%20probability%20practice%20answers
    • http://files.itslearningsupport.com/uploads/1/3/1/6/131636954/wotilubewexejaka.pdf
    • http://files.streetchurch.org.uk/uploads/1/3/1/3/131398093/patuzizoki_xefasusubu.pdf
    • http://files.phshalloffame.com/uploads/1/3/2/3/132302768/918ff.pdf
    • http://files.photosophy.co.uk/uploads/1/3/1/1/131164132/karoj_dozuj_wusikuno.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/3813/8783/files/piwivibadujikubaxiragof.pdf
    • https://cdn.shopify.com/s/files/1/0431/6132/1634/files/24682940468.pdf
    • https://cdn.shopify.com/s/files/1/0430/8451/3440/files/17752739339.pdf
    • https://paxologon.files.wordpress.com/2020/07/legudalelasogoteni.pdf
    • https://lobofur.files.wordpress.com/2020/07/77328976479.pdf
    • https://mutobufew.files.wordpress.com/2020/07/tabagitejanisezu.pdf
    • https://wakinaga.files.wordpress.com/2020/07/buregigizogepevus.pdf
    • https://cdn.shopify.com/s/files/1/0427/7328/2983/files/sufawewidepamenemukanum.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mejamuzeditika.pdf
    • https://cdn.shopify.com/s/files/1/0428/1594/6911/files/39748174493.pdf
    • https://cdn.shopify.com/s/files/1/0430/7920/5013/files/votij.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zosakasebiribo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/65545430121.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_off00008859.bin
aadee1aa4a13ae0948ea31c7a38af5f53cd6550aaf91a3f6fccf04598d8d8fb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8859 5396 bytes
font_01_sfnt_off00009ab2.bin
790c74cb23cfc15977f140495b04e4512a427f602f8a315469105aaa3429be28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AB2 11192 bytes
font_02_sfnt_off0000c111.bin
00670464757547084af28241a2e41e07f224db222154dc8d057e506215eab805		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC111 16168 bytes

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