Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dc64211fbbe424e…

MALICIOUS

PDF

44.4 KB Created: 2020-08-09 00:05:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 556cf6add592e1d7c153e45d8102509a SHA-1: e0e74d956c43d16eb095c0298fa5bcebd2fe692a SHA-256: 0dc64211fbbe424ea7405e6d8a50ab47f80b3e15be0ccecaa4a356389bcc9ba4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation or traffic generation. One critical heuristic identified a link to known malicious redirector infrastructure at 'ttraff.com'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=preschool+activities+worksheets+pdf', reinforcing the malicious redirector finding.

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.com/pify?keyword=preschool+activities+worksheets+pdf
    • http://files.kyoeiuni.com/uploads/1/3/1/4/131407012/wutalowatidagam-pilojarowijiti-gadow-malibugixojam.pdf
    • http://files.binhamvillagehall.co.uk/uploads/1/3/0/7/130775868/f9625a.pdf
    • http://files.hardbody4x4.com/uploads/1/3/2/7/132740951/rokoti_juvimovos_gatexazezexose_doxobes.pdf
    • http://files.mazamo.co.uk/uploads/1/3/1/8/131872055/2330491.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0437/2781/4805/files/raspberry_pi_media_server.pdf
    • https://cdn.shopify.com/s/files/1/0427/4513/5260/files/rasusok.pdf
    • https://cdn.shopify.com/s/files/1/0431/7108/6485/files/caribbean_social_studies_for_csec_textbook_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/6150/1336/files/pekuxolakibotapenaduxuj.pdf
    • https://cdn.shopify.com/s/files/1/0429/7926/2615/files/castle_amber.pdf
    • https://cdn.shopify.com/s/files/1/0429/1185/8855/files/23291445307.pdf
    • https://cdn.shopify.com/s/files/1/0433/1172/6750/files/laxisezi.pdf
    • https://cdn.shopify.com/s/files/1/0432/3616/3747/files/kepedikezekuwab.pdf
    • https://cdn.shopify.com/s/files/1/0432/2004/1886/files/zujepulis.pdf
    • https://cdn.shopify.com/s/files/1/0430/1396/3939/files/buxexugomakodosojorabi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064e8.bin
38bc7844f525103341886149030efdc2ac012fcf7e28216aa13406b6b887927e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64E8 5140 bytes
font_01_sfnt_off00007688.bin
9acd50248cc023f3428ef1821c497684f1d41ad2248b588c72c3a8043c178b67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7688 9424 bytes
font_02_sfnt_off000096c0.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96C0 4324 bytes

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