Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfd4c900c9d63de6…

MALICIOUS

PDF

49.8 KB Created: 2020-07-18 23:54:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3b7d9e8b52be1fa55c9721acbfd7960 SHA-1: af5b8032331cc69446753f95bf9b33f2f467a394 SHA-256: dfd4c900c9d63de630c4357b96deb6278fa8b6a7660414c42dddbf2185714511
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains text related to business letters and the authoring application, suggesting a lure to entice users to click the malicious links. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm strategy to distribute the malicious payload.

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/wb?keyword=effective%20business%20letter%20writing%20pdf
    • http://files.boonvillemusic.com/uploads/1/3/1/4/131407708/310e0.pdf
    • http://files.carlsbadlancerbands.com/uploads/1/3/1/0/131070526/6849050.pdf
    • http://files.upwellings.com/uploads/1/3/1/6/131607174/c3eb020e.pdf
    • http://files.ninety4feet.com/uploads/1/3/1/3/131379971/626c94a83.pdf
    • http://files.gpnart.com/uploads/1/3/1/4/131437880/5862123.pdf
    • https://zifapudig.fil
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/63016720996.pdf
    • https://cdn.shopify.com/s/files/1/0431/8488/1825/files/75365228208.pdf
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/70899006671.pdf
    • https://zifapudig.files.wordpress.com/2020/06/40581948355.pdf
    • https://fojekiv.files.wordpress.com/2020/07/86727763003.pdf
    • https://xixejim.files.wordpress.com/2020/07/sufalifujosako.pdf
    • https://cdn.shopify.com/s/files/1/0436/6453/9798/files/fiwanaralatokozoxu.pdf
    • https://cdn.shopify.com/s/files/1/0434/9778/3458/files/sukote.pdf
    • https://cdn.shopify.com/s/files/1/0430/5593/9733/files/57855294181.pdf
    • https://cdn.shopify.com/s/files/1/0430/3604/9571/files/18360156137.pdf
    • https://cdn.shopify.com/s/files/1/0431/0899/1140/files/vopojedapetixitazogej.pdf
    • https://cdn.shopify.com/s/files/1/0432/1751/8751/files/56357104200.pdf
    • https://cdn.shopify.com/s/files/1/0434/1648/6040/files/xojij.pdf
    • https://cdn.shopify.com/s/files/1/0429/1087/5815/files/wuxomafiv.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_off0000842f.bin
6adc6fb7babaa37e3bf518aeef409b0cf187a26871783b619fa7b39e2fc8cd0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x842F 5132 bytes
font_01_sfnt_off000095c2.bin
64d9837b1f84e29627b7dff97dd5e3005f437735cdcdedecc634108907cb8864		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95C2 10484 bytes

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