Malicious PDF — malware analysis report

Static analysis result for SHA-256 c29bb303f1d331da…

MALICIOUS

PDF

40.2 KB Created: 2020-08-16 13:13:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c826e970555889cfecb7eac6bcb3b782 SHA-1: ece78b69cdce1ef42a4e6eb07ae86f4def31d33e SHA-256: c29bb303f1d331da9c43d6ab7772dac33691772beddc2a535fbb69f89efd833d
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=radio+news+reporter+job+description', which is associated with malicious redirector infrastructure. The presence of numerous links suggests an attempt to lure users to external, potentially harmful, sites.

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=radio+news+reporter+job+description
    • http://files.fridakahlostory.com/uploads/1/3/1/3/131379168/dexolagupi_najafutemavojak_kesujuwoxuf_negopodipew.pdf
    • https://cdn.shopify.com/s/files/1/0437/3115/7143/files/peripheral_artery_disease_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0433/5671/7224/files/avesta_versiones_en_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0429/8833/9361/files/24846542430.pdf
    • https://cdn.shopify.com/s/files/1/0440/6178/6262/files/livro_admirvel_mundo_novo_em.pdf
    • https://cdn.shopify.com/s/files/1/0430/5331/8306/files/51881237423.pdf
    • https://cdn.shopify.com/s/files/1/0432/4678/0566/files/jilutizelugofapizoxiboloz.pdf
    • https://cdn.shopify.com/s/files/1/0432/6323/0116/files/where_is_java_exe_located.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/16485275060.pdf
    • https://cdn.shopify.com/s/files/1/0436/4691/0624/files/abelian_varieties_mumford.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_off00005f8d.bin
6a1052fde4f514c2642b7f5d067718d1c7d115470c0057d41f77d0a3b43adfaf
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F8D 5348 bytes
font_01_sfnt_off000071d8.bin
3e0644536bb2d8816b98f61323266e06397539e556a1de724e82b0116016f9f0
pdf-font-stream PDF embedded font (sfnt) at offset 0x71D8 10084 bytes