Malicious PDF — malware analysis report

Static analysis result for SHA-256 481f562ce1374c19…

MALICIOUS

PDF

45.4 KB Created: 2020-08-05 08:00:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1c245e977dd8765f1ece1f8bfedc2bb SHA-1: 7800d3e07291ae5c324c6dadce9f4787616f0bf9 SHA-256: 481f562ce1374c19422d5365925edfa93f80a9634993fd4b595e79fb34e36ad8
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link likely leads to a malicious site designed to exploit users. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute the 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.cc/wb?keyword=confined%20spaces%20risk%20assessment%20pdf
    • http://files.leafoutak.com/uploads/1/3/0/7/130739648/rizofarovim.pdf
    • http://files.sdmarian.org/uploads/1/3/1/6/131606631/kafenir.pdf
    • http://resop.centralofmelbourne.com/uploads/1/3/1/6/131636655/1948216.pdf
    • http://files.selbylibraryfriends.org/uploads/1/3/1/0/131070911/a9dff903a67294.pdf
    • https://cdn.shopify.com/s/files/1/0433/4285/6344/files/xubaxedewojilofinebewi.pdf
    • https://cdn.shopify.com/s/files/1/0435/1374/1472/files/755541310.pdf
    • https://cdn.shopify.com/s/files/1/0428/0382/2755/files/lakonakonudenipobog.pdf
    • https://cdn.shopify.com/s/files/1/0429/5606/2876/files/xezitovusezirovamol.pdf
    • https://cdn.shopify.com/s/files/1/0440/4294/4677/files/18429324950.pdf
    • https://cdn.shopify.com/s/files/1/0432/6581/8789/files/form_st_105.pdf
    • https://cdn.shopify.com/s/files/1/0435/5014/6723/files/59213344453.pdf
    • https://cdn.shopify.com/s/files/1/0433/8299/7148/files/chingiz_aitmatov_the_first_teacher.pdf
    • https://cdn.shopify.com/s/files/1/0433/7431/3633/files/19140865909.pdf
    • https://cdn.shopify.com/s/files/1/0434/3637/6214/files/bejowopukol.pdf
    • https://cdn.shopify.com/s/files/1/0428/9223/0823/files/ht2000_motherboard_manual.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_off0000746d.bin
12f298711649733473ca74052f98e66f3fb5f1d8ca790342f2a43630b3d0230e
pdf-font-stream PDF embedded font (sfnt) at offset 0x746D 5240 bytes
font_01_sfnt_off0000862e.bin
ad2ada7eef3b163009c3f22bb6e4977cdd262b372f7be68fcb27835a74af8e6e
pdf-font-stream PDF embedded font (sfnt) at offset 0x862E 10148 bytes