Malicious PDF — malware analysis report

Static analysis result for SHA-256 18e3e637ad342f7c…

MALICIOUS

PDF

44.2 KB Created: 2020-08-07 21:57:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9207d2c237f909e293967ee9ccef1a1 SHA-1: 873b23b25f9b04ff491dfa49b070a5dea610ee67 SHA-256: 18e3e637ad342f7c70281f4c93e9115a2cb02336d9788de0d23ab983244ea5dd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link that redirects to known malicious infrastructure, indicating a phishing or scam attempt. The document body, though heavily obfuscated, contains the same URL. The presence of numerous external PDF links, many pointing to benign Shopify URLs, suggests an attempt to manipulate search engine results or create a link farm, potentially for SEO poisoning or to obscure the malicious redirector.

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=swift+algorithms+and+data+structures+pdf
    • http://ninopezo.fringedbenefitsdesign.com/uploads/1/3/1/8/131856772/2336926.pdf
    • http://files.the-tan-can.com/uploads/1/3/1/4/131413678/diponujeje.pdf
    • http://files.klarahorackova.com/uploads/1/3/1/4/131437702/zunetamilezuju.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/8759/2608/files/fegaburikolexagawilugiza.pdf
    • https://cdn.shopify.com/s/files/1/0433/4193/8856/files/rorojapawom.pdf
    • https://cdn.shopify.com/s/files/1/0432/6011/7160/files/24283844366.pdf
    • https://cdn.shopify.com/s/files/1/0439/1151/2232/files/jelesedawapatikazakiv.pdf
    • https://cdn.shopify.com/s/files/1/0429/7719/8229/files/jhumka_gira_ray.pdf
    • https://cdn.shopify.com/s/files/1/0429/9898/8949/files/exalted_name_generator.pdf
    • https://cdn.shopify.com/s/files/1/0438/0983/3117/files/43121742419.pdf
    • https://cdn.shopify.com/s/files/1/0431/6551/5933/files/87646060665.pdf
    • https://cdn.shopify.com/s/files/1/0429/6107/6375/files/12955272724.pdf
    • https://cdn.shopify.com/s/files/1/0436/2525/0974/files/baby_sitters_club_books.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_off00006bcf.bin
c4c0947707d10a09942d01a80f705500398005e2d26237b81cbc503b01488e8a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6BCF 5764 bytes
font_01_sfnt_off00007f5e.bin
1597a20d4abef0e20eef84fe24743460d27c547519e14454d67eb4d01a562475
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F5E 10672 bytes