Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cdbba044070b84c…

MALICIOUS

PDF

43.5 KB Created: 2020-08-30 08:12:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fcb2c02ca2e4bbb646b412198561185d SHA-1: a23c56f353176288032478d7e0ab958c987eaafa SHA-256: 7cdbba044070b84c1df473e708ae4e432c7b1caeeccf4310948b7d55d8feea3e
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. It also exhibits characteristics of a PDF link farm, embedding numerous external links, many hosted on Shopify. The primary malicious URL identified is ttraff.ru, which is likely used to redirect users to further malicious content. The document body itself is heavily obfuscated but contains the malicious URL and several benign-looking Shopify URLs, suggesting a lure or redirection mechanism.

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/wix?keyword=sudoku+con+respuestas
    • https://cdn.shopify.com/s/files/1/0438/4089/7181/files/pakajedoxuvivulijegopure.pdf
    • https://cdn.shopify.com/s/files/1/0428/9875/1641/files/69715613376.pdf
    • https://cdn.shopify.com/s/files/1/0433/9220/4950/files/fegamitonixiban.pdf
    • https://cdn.shopify.com/s/files/1/0432/1578/2048/files/infective_endocarditis_clinical_practice_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0427/9920/2467/files/vevebokodupunukox.pdf
    • https://static.usrfiles.com/ugd/b8c837_81a30c15573c4d93b5b754f527edbcfe.pdf
    • https://cdn.shopify.com/s/files/1/0432/9511/3374/files/16306029985.pdf
    • https://cdn.shopify.com/s/files/1/0432/1555/2672/files/89665112047.pdf
    • https://cdn.shopify.com/s/files/1/0432/6552/3862/files/penipedagilavetobefidul.pdf
    • https://cdn.shopify.com/s/files/1/0435/6590/8123/files/75562132669.pdf
    • https://cdn.shopify.com/s/files/1/0433/7418/2563/files/oneplus_3t_twrp.pdf
    • https://static.usrfiles.com/ugd/ae059d_5c4800296dea4152b36e27247429a6ad.pdf
    • https://static.usrfiles.com/ugd/9ff9b8_00f7684f025d458892ec26ba5be7e7ea.pdf
    • https://static.usrfiles.com/ugd/b8c837_e0b36f88c26a46d19c216f3f97faa2aa.pdf
    • https://static.usrfiles.com/ugd/b8c837_3d2309370a324b2c9b9d451de9dedad4.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_off00006ab8.bin
6d1188ad6dc23bec9348156b709e9a51e1505cd3ef2401e0cdf4f75008919194
pdf-font-stream PDF embedded font (sfnt) at offset 0x6AB8 5200 bytes
font_01_sfnt_off00007c6c.bin
fb36ef793f247afb627d5391906242509bb88eaee80abcf138597ac467f7f404
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C6C 10768 bytes