Malicious PDF — malware analysis report

Static analysis result for SHA-256 21ac6a2a2decfb0d…

MALICIOUS

PDF

58.2 KB Created: 2020-08-07 22:52:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 0463c36a7867b40c9b3f138f1c471fd7 SHA-1: 4ab5718b9b6de80fe4479ddc91a5320e3764c9ec SHA-256: 21ac6a2a2decfb0d05cb755ed746af7642193cdbd9586c6457e904b7636a11e8
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms this, and the 'PDF_SEO_LINK_FARM' indicates a large number of outbound links, many hosted on Shopify. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector appears to be a deceptive link within the document body, likely intended to lead users to malicious content.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=microprocessor+and+assembly+language+programming+pdf In PDF document text
    • http://libekunut.thevorsters.com/uploads/1/3/0/9/130969465/2c4d51359ca3040.pdfIn PDF document text
    • http://files.osoclean.net/uploads/1/3/2/7/132740187/8602217.pdfIn PDF document text
    • http://zezefo.scautoservices.co.uk/uploads/1/3/0/7/130739704/4913322.pdfIn PDF document text
    • http://zoveg.raggedmountainrunning.com/uploads/1/3/0/9/130969744/be1307898a2.pdfIn PDF document text
    • http://files.heartofachildministries.org/uploads/1/3/2/7/132740716/tokevoguxeteg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0439/1475/6251/files/81087202132.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0212/6751/files/95765016315.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2988/7136/files/71616465465.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4614/2114/files/41961520891.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9456/4252/files/bafiwenubifagujuxolepum.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6255/7856/files/rofonemo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1678/0951/files/75537066086.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7661/6341/files/nadukorilulolusaxebegat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6360/6429/files/wepunikekiro.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6418/0390/files/icse_class_11_biology_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/1589944702.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008d83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D83 5524 bytes
SHA-256: c057513ddeb33db54b6776f60bc49fe01a7609b6c6299d1e6c2c7d80e6f57678
font_01_sfnt_off0000a02d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA02D 13288 bytes
SHA-256: 2b5bbff478865cecab3230f72d4d8bb29da2cd5c7aa051636b407ed546a2a7c2
font_02_sfnt_off0000ca9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9E 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e