Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ea35dd938d58fd0…

MALICIOUS

PDF

42.6 KB Created: 2020-08-22 01:53:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2f31e7da715ad86a151294103582936 SHA-1: fa5d597dabcc01ecc8d4700eb796c635da376427 SHA-256: 7ea35dd938d58fd01448b40d0a7ec9b8b18a9bb93dd2cacc9156edf07ffaf6d6
152 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDF files. One URL, https://ttraff.ru/pify?keyword=baofeng+uv+82l+manuale+italiano, is identified as a malicious redirector. The ML classifier strongly indicates maliciousness, and the presence of multiple external links suggests an attempt to manipulate search engine results or distribute further malicious content.

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=baofeng+uv+82l+manuale+italiano
    • http://mefanisu.neddnews.com/uploads/1/3/1/1/131164250/9fb489ef2e947.pdf
    • http://files.sandlotwesterville.com/uploads/1/3/1/0/131070212/xurinutinotoxege.pdf
    • http://files.talltaledesigns.com/uploads/1/3/0/8/130874010/7280087.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/6735074847.pdf
    • https://cdn.shopify.com/s/files/1/0437/8093/1742/files/investigacion_de_accidentes_laborales.pdf
    • https://cdn.shopify.com/s/files/1/0452/7934/6850/files/afcat_2020_question_paper_with_solution.pdf
    • https://cdn.shopify.com/s/files/1/0432/3940/7784/files/67306291372.pdf
    • https://cdn.shopify.com/s/files/1/0436/1791/0944/files/good_english_grammar_book.pdf
    • https://cdn.shopify.com/s/files/1/0427/6515/6508/files/fatidirosakobuxefiv.pdf
    • https://cdn.shopify.com/s/files/1/0438/5308/6885/files/40541439497.pdf
    • https://cdn.shopify.com/s/files/1/0436/4537/0518/files/3046686047.pdf
    • https://cdn.shopify.com/s/files/1/0430/9663/7597/files/1742856528.pdf
    • https://cdn.shopify.com/s/files/1/0460/6545/1163/files/block_ads_android_no_root.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_off00005abc.bin
f95e873942452c8a570a658fde4cbac142ec002de276d3ed33a5eac7d286974a
pdf-font-stream PDF embedded font (sfnt) at offset 0x5ABC 5248 bytes
font_01_sfnt_off00006c9c.bin
e2a2f196b92c9cfac2a4f6d3b706141c53b0e492142e9714e7846148c51faa85
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C9C 15904 bytes