Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b957250b006a864…

MALICIOUS

PDF

38.2 KB Created: 2020-08-18 18:19:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6bc7ca9728b33a7c3834f1427813f84 SHA-1: 34eb770a95b60fd9f34b0ac087922783cd84a61c SHA-256: 8b957250b006a864aa0ec9c74944771624f4986320382c0d70f113c890e3e7e9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link farm designed to manipulate search engine results, with a primary malicious redirector URL. The document body, though heavily obfuscated, contains the target URL and references to 'wedding invitation video template after effects', suggesting a lure. The ML classifier strongly indicates maliciousness.

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=wedding+invitation+video+template+after+effects
    • http://files.dr-chiropractic.co.uk/uploads/1/3/1/4/131408465/78eaa2c94dc1339.pdf
    • http://files.teviasa.com/uploads/1/3/2/7/132741225/4959704.pdf
    • https://cdn.shopify.com/s/files/1/0433/7749/2118/files/kidixegopararubosuri.pdf
    • https://cdn.shopify.com/s/files/1/0437/3748/1365/files/xonarelivijira.pdf
    • https://cdn.shopify.com/s/files/1/0428/6034/7551/files/64831146719.pdf
    • https://cdn.shopify.com/s/files/1/0433/2234/3577/files/queen_loft_bed_plans.pdf
    • https://cdn.shopify.com/s/files/1/0427/8901/1612/files/suporifafakerivojuzapap.pdf
    • https://cdn.shopify.com/s/files/1/0433/5026/1911/files/lesilizawajike.pdf
    • https://cdn.shopify.com/s/files/1/0429/6769/5523/files/jewanafidojibetenuliv.pdf
    • https://cdn.shopify.com/s/files/1/0428/2135/3635/files/42710522954.pdf
    • https://cdn.shopify.com/s/files/1/0431/4673/9878/files/numilezupamixuzu.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_off00005675.bin
f04fcecbbba198bd1dfd7974438d00b19805d7ed5f64080f8c61a586a9fcdf82		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5675 5548 bytes
font_01_sfnt_off0000694e.bin
112bd5c59bc2bb022124805abce54c85a9ce1757535d354ec40034487c3a181a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x694E 10128 bytes

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