Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aad139852c0c52b…

MALICIOUS

PDF

38.1 KB Created: 2020-08-25 05:56:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 60ed3db13d36e18b91d86664357221cb SHA-1: cecf3920161c9eff9b48a5d8ed80a83f2ef934ae SHA-256: 7aad139852c0c52bb3164c17ed50db236da0577ccfddb322b2540acd85b5b983
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to benign Shopify URLs, but one critical link redirects to a known malicious domain, ttraff.ru. This suggests a link farm or SEO poisoning tactic designed to funnel users to malicious content. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing or redirection attack.

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=5.+s%25C4%25B1n%25C4%25B1f+sosyal+bilgiler+test+pdf
    • http://files.reventnews.com/uploads/1/3/2/6/132696512/gobajoxorijazuxuwe.pdf
    • http://files.shepherdoflife.org/uploads/1/3/1/6/131606819/4e389fb3c6.pdf
    • http://files.realjackoftrades.com/uploads/1/3/0/8/130874050/4800150.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0457/4923/9964/files/android_studio_auto_remove_unused_imports.pdf
    • https://cdn.shopify.com/s/files/1/0429/9787/4851/files/surface_area_of_prisms_and_cylinders_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0436/4202/8182/files/takasitadelisipap.pdf
    • https://cdn.shopify.com/s/files/1/0429/2460/5599/files/coordinate_geometry_worksheet_class_9.pdf
    • https://cdn.shopify.com/s/files/1/0430/5040/1943/files/kujovanegevunawose.pdf
    • https://cdn.shopify.com/s/files/1/0439/6145/0654/files/xaxivifazufagizago.pdf
    • https://cdn.shopify.com/s/files/1/0430/4610/9345/files/jakapedigen.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/16175378270.pdf
    • https://cdn.shopify.com/s/files/1/0430/9037/8909/files/vexevexixed.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_off00005541.bin
f055588cb7e9bdf9c955b9b50dc34245f6a4426c20386fb3b22125a1f808cf4e
pdf-font-stream PDF embedded font (sfnt) at offset 0x5541 5544 bytes
font_01_sfnt_off00006836.bin
956c7255431260abf34696e8c72b2a3fe1934a55d04411e87d4bc072fc8f140b
pdf-font-stream PDF embedded font (sfnt) at offset 0x6836 10416 bytes