Malicious PDF — malware analysis report

Static analysis result for SHA-256 e85c23ff9899d188…

MALICIOUS

PDF

40.9 KB Created: 2020-08-31 21:36:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21d2f74f72788de3fed1c132ace82f0d SHA-1: 63e2450b1d69569853d1e18d4c594dda37b344c1 SHA-256: e85c23ff9899d188375405125b9bc47c30a0818c7e7a48479379c358013fe738
154 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 'https://ttraff.ru/wix?keyword=web+archive%2528+warc+format'. Additionally, it exhibits a PDF link farm heuristic, with numerous links to PDF files hosted on cdn.shopify.com, including 'https://cdn.shopify.com/s/files/1/0431/6335/3244/files/mazud.pdf'. The ML classifier also strongly flagged this PDF as malicious. The document body text, though heavily obfuscated, contains the redirector URL, suggesting a lure to external 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/wix?keyword=web+archive%2528+warc+format
    • https://cdn.shopify.com/s/files/1/0431/6335/3244/files/mazud.pdf
    • https://cdn.shopify.com/s/files/1/0447/9392/1685/files/pupunutegojitogiwinug.pdf
    • https://cdn.shopify.com/s/files/1/0431/4071/0566/files/71880176004.pdf
    • https://cdn.shopify.com/s/files/1/0429/5032/8486/files/40472559741.pdf
    • https://cdn.shopify.com/s/files/1/0433/1572/4456/files/c4d_e7_bb_91_e5_b8_a6.pdf
    • https://cdn.shopify.com/s/files/1/0434/9480/1568/files/vudepevojig.pdf
    • https://cdn.shopify.com/s/files/1/0431/6574/5303/files/pufubuwasebap.pdf
    • https://cdn.shopify.com/s/files/1/0435/8098/1407/files/67564196589.pdf
    • https://cdn.shopify.com/s/files/1/0431/6859/6123/files/kaxirofupajijelu.pdf
    • https://static.usrfiles.com/ugd/4117a9_415815764ac94468b96cf035ba0954eb.pdf
    • https://static.usrfiles.com/ugd/837d34_393ca19291794d679ad38da5f3a9ba26.pdf
    • https://static.usrfiles.com/ugd/06497e_fc6873deafe94d2ebffc6c67b96cfe51.pdf
    • https://static.usrfiles.com/ugd/b8c837_affdca35539d4e3f84b75cf182a391b1.pdf
    • https://cdn.shopify.com/s/files/1/0434/5918/2745/files/circle_with_a_dot_in_the_middle.pdf
    • https://cdn.shopify.com/s/files/1/0440/7423/8102/files/merge_excel_sheets_with_different_columns.pdf
    • https://cdn.shopify.com/s/files/1/0434/5374/3270/files/neliviw.pdf
    • https://cdn.shopify.com/s/files/1/0434/1540/4711/files/quraner_alo.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_off00006076.bin
e6f0f55e3f89db8c5338b4386c13c234617f5270d433a8b6d6b29ef05b8ddcd2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6076 5296 bytes
font_01_sfnt_off00007280.bin
9dea182f1d3843a0f13a654696f1a21e51d7ca4e6c21fac393cf9b7b26e3e242		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7280 10696 bytes

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