Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb5325532c2b5ef5…

MALICIOUS

PDF

69.2 KB Created: 2020-08-24 05:21:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5db448fa25a30e0e7199f45fcd6c8da SHA-1: efb29df83e7b254ada942e0ff98cd20e4e4b71b1 SHA-256: eb5325532c2b5ef5d58684af24f09ade454b3e4874d168c68a14e11187ebc82e
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to SEO-optimized PDF files hosted on Shopify. One of these links, 'https://ttraff.cc/pify?keyword=number_format+javascript+like+php', is identified as a known malicious redirector. This suggests a campaign to lure users to malicious content through a link farm. The ML classifier also strongly indicated 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.cc/pify?keyword=number_format+javascript+like+php
    • http://files.hareloomupholstery.com/uploads/1/3/2/6/132696604/291982.pdf
    • http://files.ccwestlibrary.com/uploads/1/3/1/0/131069934/punepivob-sokixanosake.pdf
    • http://files.chi-dna.com/uploads/1/3/0/7/130739744/rugazelokif-xadawetug.pdf
    • http://files.wcoastbeads.com/uploads/1/3/1/8/131857920/sajuvorixajutafafet.pdf
    • https://cdn.shopify.com/s/files/1/0439/9041/7566/files/android_developer_jobs_in_bangalore_for_experienced.pdf
    • https://cdn.shopify.com/s/files/1/0440/0267/2798/files/schoenberg_pierrot_lunaire.pdf
    • https://cdn.shopify.com/s/files/1/0436/5592/1817/files/91284549228.pdf
    • https://cdn.shopify.com/s/files/1/0431/2144/2965/files/sajasirososub.pdf
    • https://cdn.shopify.com/s/files/1/0433/0799/1195/files/fanuc_robot_teach_pendant_manual.pdf
    • https://cdn.shopify.com/s/files/1/0465/0870/3894/files/nepuwotav.pdf
    • https://cdn.shopify.com/s/files/1/0437/5861/6733/files/fuwabosarawilofitagov.pdf
    • https://cdn.shopify.com/s/files/1/0429/9145/2314/files/35560625396.pdf
    • https://cdn.shopify.com/s/files/1/0435/3087/9125/files/org_chart_template_word.pdf
    • https://cdn.shopify.com/s/files/1/0432/3124/8539/files/nesabogo.pdf
    • https://cdn.shopify.com/s/files/1/0427/7311/9143/files/89674643100.pdf
    • https://cdn.shopify.com/s/files/1/0431/1895/2612/files/62169097261.pdf
    • https://cdn.shopify.com/s/files/1/0428/3557/4943/files/75006781804.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_off0000b974.bin
dc9cafd0ada53f2baf7eeb752449ccf2d8f98972630cdd84080202e5d79469fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB974 5596 bytes
font_01_sfnt_off0000cc6f.bin
f2d1504538531139f181efe93854bf909f78c3bd280c09765f9bc134f284b055		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC6F 20616 bytes

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