Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6aafa7eabcfb3a3…

MALICIOUS

PDF

40.6 KB Created: 2020-09-17 03:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1fe402be1b0e5694c8b1ad84d4531d4f SHA-1: 1ac27d7c48e3256cc742a6a0947d3968c0057b00 SHA-256: d6aafa7eabcfb3a3c7d698dc350dacb518448eaebd7d28bc42e8eed339f0569d
152 Risk Score

Malware Insights

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

The PDF document was identified as malicious by a machine learning classifier and contains a significant number of embedded links, constituting a link farm. One of these links, 'https://ttraff.me/wix?keyword=relationship+between+frequency+and+energy+direct+or+inverse', points to known malicious redirector infrastructure. The document body, though partially corrupted, contains text related to physics concepts, likely as a lure to disguise the malicious intent of the embedded links.

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.me/wix?keyword=relationship+between+frequency+and+energy+direct+or+inverse
    • https://9ca85f94-d88a-41a3-a67d-12ce2e0e9f18.filesusr.com/ugd/8e1900_5c721f31e4314b7c8aeef6de8242568a.pdf?index=true
    • https://43fc62cf-ff9d-4f95-9302-50eb9edf88dc.filesusr.com/ugd/d2cc1f_da5074b57bb6443dbc595c59dea54f7f.pdf?index=true
    • https://125e6392-2837-4a55-be48-a51a257ec399.filesusr.com/ugd/d43733_d4c83abb6cb845468bbaa6646a956798.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0427/6443/5612/files/1891430975.pdf
    • https://9b428baf-2960-4fc1-9eaa-d11ada3c4426.filesusr.com/ugd/912de2_522a2f1e332b462db976722294749267.pdf?index=true
    • https://c7a11435-5e4c-4e72-b19e-4935a42c266e.filesusr.com/ugd/031dda_5e62a3905a4c469dbe2382dff58b8a82.pdf?index=true
    • https://6dde3fb5-79dc-4302-b446-2f0329ebb4c1.filesusr.com/ugd/bf0735_11e047627e9c4b9dbbb5abef0c7b5b1d.pdf?index=true
    • https://dc840ecb-ef54-4340-a4a6-a5613d2ca5b8.filesusr.com/ugd/6f9b04_a3d7e7bea92e49f7b87f1eb6ebfa1735.pdf?index=true
    • https://d7d50897-c55d-4c68-a94d-796df3a55a1f.filesusr.com/ugd/e5a943_863ad55a33f34c2786919057338f8a35.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0428/3128/2335/files/pathfinder_ultimate_campaign.pdf
    • https://cdn.shopify.com/s/files/1/0438/5590/4918/files/41339063134.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_off00005daa.bin
ee4da4a954ea4873274a75b61169e00496f3b36390382d5b9ca99aee03bb3134
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DAA 5944 bytes
font_01_sfnt_off000071f5.bin
59c38b10c81c002645b0c02be9b934f481fe34b797bede678f694dd202868b92
pdf-font-stream PDF embedded font (sfnt) at offset 0x71F5 10400 bytes