Malicious PDF — malware analysis report

Static analysis result for SHA-256 74222d0b67fbb63b…

MALICIOUS

PDF

51.6 KB Created: 2020-08-05 06:18:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 86b2e4bae661062f24c3b15964609a24 SHA-1: 86fffe0614b4133ad38362872c815652c55d884b SHA-256: 74222d0b67fbb63bc6cb89914dab9abb5caf2bbcfb16c1a717221986f8f9a142
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector pointing to 'https://ttraff.com/pify?keyword=ischemic+stroke+journal+pdf'. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO manipulation tactic. The ML classifier also strongly indicated maliciousness.

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=ischemic+stroke+journal+pdf
    • http://files.honeybugscornwall.co.uk/uploads/1/3/1/6/131606330/7161029.pdf
    • http://files.ojibwe-dakota-in-mn.com/uploads/1/3/1/1/131163687/04f258.pdf
    • http://files.kresinternationaladmissions.com/uploads/1/3/1/4/131437454/ddaa923282b03a.pdf
    • http://files.antengineering.com.au/uploads/1/3/0/8/130874396/lepazalevajitanol.pdf
    • http://files.sunninghill.com.au/uploads/1/3/1/1/131164573/53d41.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/1400/2587/files/4666998607.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65039204935.pdf
    • https://cdn.shopify.com/s/files/1/0431/3225/6407/files/witcher_2_mods.pdf
    • https://cdn.shopify.com/s/files/1/0434/3542/5944/files/vunebuxi.pdf
    • https://cdn.shopify.com/s/files/1/0437/4197/0583/files/66923547805.pdf
    • https://cdn.shopify.com/s/files/1/0432/5982/2244/files/10256882450.pdf
    • https://cdn.shopify.com/s/files/1/0433/5622/5688/files/28338956858.pdf
    • https://cdn.shopify.com/s/files/1/0432/5608/6696/files/61148684280.pdf
    • https://cdn.shopify.com/s/files/1/0438/4312/5405/files/89933067265.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_off00008ad2.bin
32681fe343ca4c7a5656d905cc9f919d3f1dde95cc44587aa07500140e3e1e5f
pdf-font-stream PDF embedded font (sfnt) at offset 0x8AD2 5472 bytes
font_01_sfnt_off00009d46.bin
2ab08a31bfb6c43ef9a203cb12623cc974a2eac33d65ceb50fe5c6e8f3051fb9
pdf-font-stream PDF embedded font (sfnt) at offset 0x9D46 10808 bytes