Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ca36c797e15a7fc…

MALICIOUS

PDF

40.0 KB Created: 2020-11-01 10:46:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3be029ee050bdbe82cb5adae6e25957d SHA-1: 995e81c1e05ac0ef8d05b1ecd36c3ac414741842 SHA-256: 5ca36c797e15a7fc7613a43dcac4306a04ca76df77506c5d11f0bceb40fb21a1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM. The document body, though heavily obfuscated, contains a URL that points to a known malicious redirector. The ML classifier also flagged this PDF with high confidence. The presence of numerous links suggests an attempt to manipulate search engine results or to redirect users to potentially harmful 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.com/123?keyword=tactical+tailor+mav+chest+rig
    • https://lefedatit.weebly.com/uploads/1/3/0/7/130776734/gakixidinugewun.pdf
    • https://cdn-cms.f-static.net/uploads/4409098/normal_5f93805d78bf7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/nujosuwemedadi/phil_swift_wikipedia.pdf
    • https://s3.amazonaws.com/biwubeleba/how_to_cite_dsm_5.pdf
    • https://uploads.strikinglycdn.com/files/8574cd37-8c13-4622-b934-959c69d7608b/rajenabikopux.pdf
    • https://uploads.strikinglycdn.com/files/37e327d0-c43d-449a-b19d-58f2e0a8899a/66398655776.pdf
    • https://s3.amazonaws.com/dusubonifu/crop_rotation_in_hindi.pdf
    • https://cdn.shopify.com/s/files/1/0502/8161/1458/files/henry_miller_tropic_of_cancer.pdf
    • https://s3.amazonaws.com/zesotat/mebojakilikonitodifepowa.pdf
    • https://uploads.strikinglycdn.com/files/a2f649d0-afb1-4699-8a12-eaf40eb20b9e/jigsaw_guide_rail.pdf
    • https://cdn.shopify.com/s/files/1/0268/7529/7986/files/64468777813.pdf
    • https://s3.amazonaws.com/wonoti/ariel_colouring_pages.pdf
    • https://cdn.shopify.com/s/files/1/0483/5357/5075/files/56427189721.pdf
    • https://cdn.shopify.com/s/files/1/0483/6687/8869/files/4054832797.pdf
    • https://cdn.shopify.com/s/files/1/0463/8697/0779/files/2020_chevrolet_tracker_owners_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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004f63.bin
57f13142fd806d72a2e59bf2cd5cb380d7b398a7915e1afe0c67393d11fe76a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F63 4904 bytes
font_01_sfnt_off0000600b.bin
f6e9109775485b0ac832b43164d463a7bd891852a41ab36dabc76ecf0a2c64ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x600B 10860 bytes
font_02_sfnt_off00008500.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8500 4324 bytes

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