Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef763f99431b2b6b…

MALICIOUS

PDF

39.7 KB Created: 2020-08-31 15:40:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18d22655b0b068f687fc32db735d819f SHA-1: 2b07eccf24c5a68b4722e5626b4dda0dbc3b15d4 SHA-256: ef763f99431b2b6bd718786e1c5d2769a0d9e73a72d36a3991abe816bbd823a5
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links to Shopify-hosted PDFs. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern appears to be the distribution of malicious links, potentially leading to further compromise or SEO manipulation.

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=using+async+pipe+in+template
    • https://cdn.shopify.com/s/files/1/0429/9295/9642/files/46889646111.pdf
    • https://cdn.shopify.com/s/files/1/0429/3158/5180/files/15196957191.pdf
    • https://cdn.shopify.com/s/files/1/0434/7238/8246/files/mojirobupuzeragededeluji.pdf
    • https://cdn.shopify.com/s/files/1/0430/9444/2137/files/55574032904.pdf
    • https://cdn.shopify.com/s/files/1/0433/8457/0019/files/atul_purohit_garba_album_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sujaxitedidubabupopivup.pdf
    • https://cdn.shopify.com/s/files/1/0431/6377/9240/files/nurokuratuzezu.pdf
    • https://cdn.shopify.com/s/files/1/0427/6980/9564/files/paxamixupupur.pdf
    • https://static.usrfiles.com/ugd/e3ed1f_1bb047a101ed4ec2a4393750e60032cc.pdf
    • https://static.usrfiles.com/ugd/b8c837_179209e83ce24ee09f428c79ba82157d.pdf
    • https://static.usrfiles.com/ugd/d5cf39_8c1bc1813d4f4c24a9c1af971ed767ca.pdf
    • https://static.usrfiles.com/ugd/d55797_a57a0df6ae7f49739a9951ea148fc979.pdf
    • https://static.usrfiles.com/ugd/b8c837_5d758355a40747b78d801443d6e8c92f.pdf
    • https://static.usrfiles.com/ugd/1ee69b_8b89525b7c0c48c29c03e626f8dcb2cb.pdf
    • https://static.usrfiles.com/ugd/cdb50c_25db474a849a40fe9674c01c18dd3c5e.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c73.bin
278fb26238ddd290ab8b2d30cde3e6595b9c2220a87046485775dcbc61e8e8a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C73 5252 bytes
font_01_sfnt_off00006e53.bin
5b89608259cc997de2c5f000e09dad43f68dda76ce5011c025d41b918b9e6a2f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E53 10416 bytes