Malicious PDF — malware analysis report

Static analysis result for SHA-256 713fb959da23e635…

MALICIOUS

PDF

41.8 KB Created: 2020-08-21 08:14:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c44ea98636d5c262bd26098fb9bccc91 SHA-1: 377d52cebb4613782eafe70f69a0e95bb0598520 SHA-256: 713fb959da23e635dd8623dd5b878498e1326bdb200e3622a384f73bfa1e710c
162 Risk Score

Malware Insights

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

The PDF contains a lure for an 'affirmative action plan template' which, upon clicking, redirects to a malicious URL. The ML classifier strongly indicates maliciousness, and the presence of a link farm suggests an attempt to distribute malicious content or SEO manipulation. The document body, though malformed, contains the malicious URL and references to benign-looking PDF files, likely to appear legitimate.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/pify?keyword=affirmative+action+plan+template+2018
    • http://files.cppbap.org/uploads/1/3/1/3/131380546/vobamaxatabu.pdf
    • http://wibelu.autosourceweekly.com/uploads/1/3/0/8/130813694/kafuzoxobaxukofi.pdf
    • http://files.wildida.com/uploads/1/3/0/9/130969469/jovop-vuzaxarifo-gewatusitimarem.pdf
    • http://files.tfamcon.com/uploads/1/3/1/4/131437283/8c8b30621.pdf
    • http://kibodef.greenmountainstone.com/uploads/1/3/1/4/131406390/ccd338.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/2135/3635/files/gujutoge.pdf
    • https://cdn.shopify.com/s/files/1/0429/4728/1062/files/soundarya_lahari_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0434/4312/6438/files/math_worksheets_grade_4.pdf
    • https://cdn.shopify.com/s/files/1/0432/2335/1458/files/possessive_adjectives_advanced_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0435/2363/7399/files/87778440289.pdf
    • https://cdn.shopify.com/s/files/1/0434/8251/3561/files/2548852743.pdf
    • https://cdn.shopify.com/s/files/1/0433/2837/2886/files/nufujomoxikesujoviloj.pdf
    • https://cdn.shopify.com/s/files/1/0436/0755/6258/files/66013357543.pdf
    • https://cdn.shopify.com/s/files/1/0434/5338/2822/files/duodenal_atresia.pdf
    • https://cdn.shopify.com/s/files/1/0431/7731/2405/files/fulanojiwidedagasa.pdf
    • https://cdn.shopify.com/s/files/1/0435/1387/2548/files/38181700512.pdf
    • https://cdn.shopify.com/s/files/1/0430/6498/3703/files/49866663280.pdf
    • https://cdn.shopify.com/s/files/1/0436/5680/6565/files/noriko.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_off0000645f.bin
efa71f6f8969a5fa54af806fa6a239213f83260ba4bc2ed5e948a9169f002f71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x645F 5552 bytes
font_01_sfnt_off00007731.bin
c5645548d21a34865dec647f6b9b4124789ffd508309070e75f054c85e6a4600		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7731 10156 bytes

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