Malicious PDF — malware analysis report

Static analysis result for SHA-256 190e9be518063a9e…

MALICIOUS

PDF

37.6 KB Created: 2020-08-16 12:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d36a3a84bc05a493e6c1986692db1f54 SHA-1: fea8b6a8e8c0eb66a033cacb4ed3ef8a3c7a9a49 SHA-256: 190e9be518063a9e0fbd73900b114beb73fd2585073d390cfece80ec094ba5be
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, likely as part of an SEO spam campaign. A critical heuristic identified a direct link to a known malicious redirector, ttraff.com, which is designed to lead users to malicious content. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL and several other PDF links.

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/wb?keyword=serato%20ddj%20sx%20manual
    • http://kupirip.crossplainspd.org/uploads/1/3/1/6/131606490/9782000.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/2567/0037/files/416351594.pdf
    • https://cdn.shopify.com/s/files/1/0430/6888/3098/files/autocad_import_text_recognition.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/82191842179.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zupapinited.pdf
    • https://cdn.shopify.com/s/files/1/0432/1076/8546/files/59345911839.pdf
    • https://cdn.shopify.com/s/files/1/0436/8970/5625/files/siremuv.pdf
    • https://cdn.shopify.com/s/files/1/0436/1384/7710/files/tabubegovijevekoram.pdf
    • https://cdn.shopify.com/s/files/1/0430/5738/1530/files/cetosis_en_vacas_lecheras.pdf
    • https://cdn.shopify.com/s/files/1/0438/0655/6320/files/90937017891.pdf
    • https://cdn.shopify.com/s/files/1/0428/5225/3863/files/xarenugilaxezuzobo.pdf
    • https://cdn.shopify.com/s/files/1/0428/7895/9775/files/vemaveridureneb.pdf
    • https://cdn.shopify.com/s/files/1/0440/6309/6984/files/beworawuzuwixe.pdf
    • https://cdn.shopify.com/s/files/1/0434/3326/3253/files/jupoxil.pdf
    • https://cdn.shopify.com/s/files/1/0447/0390/7993/files/wuvubidarat.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_off00004917.bin
25705bde1915232026996570971835e1f5b067934c6ef1574ae2b784afe35dda		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4917 5052 bytes
font_01_sfnt_off00005a2d.bin
ecb60d7eaeb6378954239ac06c91a1f843ab2ff36323e0ee5d2c2bd91203760f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A2D 9868 bytes
font_02_sfnt_off00007bf2.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BF2 4324 bytes

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