Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c51a4d1f3556120…

MALICIOUS

PDF

97.6 KB Created: 2020-07-27 15:56:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 50eab05a4201312c14f65b839f4bddf5 SHA-1: b222a561098995f263cd1b5612fee81ee187e7e3 SHA-256: 5c51a4d1f35561207118a3c56d331e1c48dbf149a06ddf1ebdee08e76a28de88
154 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, with one pointing to known malicious redirector infrastructure. The ML classifier also flagged this PDF with high confidence. While no scripts were extracted, the presence of numerous links suggests an attempt to lure users to malicious sites, potentially for phishing or malware distribution.

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=perioperative+antiplatelet+therapy+guidelines
    • http://files.jenniferbetteridgephotography.com/uploads/1/3/0/9/130969429/9893254.pdf
    • http://files.motivationbymaia.com/uploads/1/3/2/6/132695405/31d9e66e71c1.pdf
    • http://files.rollepodiatry.co.uk/uploads/1/3/1/6/131637631/kewudijotu_pagerozejaxuwes.pdf
    • http://files.jpactm.org/uploads/1/3/0/7/130739558/956628.pdf
    • http://files.kosherhire.com/uploads/1/3/0/7/130776500/2f8da9ebdf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/2207/4534/files/tolugus.pdf
    • https://cdn.shopify.com/s/files/1/0429/1090/8572/files/78389886386.pdf
    • https://cdn.shopify.com/s/files/1/0431/6381/1997/files/94553478760.pdf
    • https://cdn.shopify.com/s/files/1/0434/1402/8444/files/meperosug.pdf
    • https://cdn.shopify.com/s/files/1/0430/5325/2757/files/83868594776.pdf
    • https://cdn.shopify.com/s/files/1/0431/2137/7434/files/guboxidimide.pdf
    • https://cdn.shopify.com/s/files/1/0432/8076/0990/files/dogamesa.pdf
    • https://cdn.shopify.com/s/files/1/0435/5224/3861/files/nizadudojudunekaxatepob.pdf
    • https://cdn.shopify.com/s/files/1/0430/9073/9361/files/58853156977.pdf
    • https://cdn.shopify.com/s/files/1/0430/5459/6250/files/zololufofafoginipegifaba.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_off000125e5.bin
c21d501f2693b58ea6695b3c814b279063a05d86a4077d5f8ee821e19bfd4b0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125E5 5264 bytes
font_01_sfnt_off000137c7.bin
2d08008f46601b15eb0194bc4dd4dc16fb7e67a110a173c5a9cdc34e154b9c9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x137C7 13468 bytes
font_02_sfnt_off00016304.bin
49436f94d5abf10ca6af8af9848174aab82dfe7bc58a5146411d238fd5c76648		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16304 16148 bytes

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