Malicious PDF — malware analysis report

Static analysis result for SHA-256 97434ba898db8aaf…

MALICIOUS

PDF

34.5 KB Created: 2020-07-08 20:16:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 07c6ca4841ea1ba59efd1f0a531be2e0 SHA-1: 94819337e8341ebb86d9585a8f794a62481abcd0 SHA-256: 97434ba898db8aaf6b81130d5accb040609df6063bc91a9aa81eacf5c78dde9f
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 URLs, identified as a link farm. One URL, 'https://ttraff.ru/wb?keyword=moral%20dilemma%20worksheet', is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains similar URLs, suggesting a coordinated effort 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.ru/wb?keyword=moral%20dilemma%20worksheet
    • http://files.quietgovernmentmen.com/uploads/1/3/1/4/131437566/fadapinedex.pdf
    • http://files.chenowethbairddesign.com/uploads/1/3/1/8/131871894/kawal_fudomur.pdf
    • http://files.lincolnfencecontractors.com/uploads/1/3/2/6/132681938/7c5f525598fb.pdf
    • http://files.thesolidrockshop.com/uploads/1/3/0/8/130813797/zaxisufibuxuxigusi.pdf
    • http://files.haciendasonoma.com/uploads/1/3/2/7/132740218/7130198.pdf
    • http://files.washington-scottish.com/uploads/1/3/0/8/130874318/8b0f395751b7b3.pdf
    • http://files.dapperdarlingsboutique.com/uploads/1/3/2/7/132710782/mazukareradag.pdf
    • http://files.xphotographymore.com/uploads/1/3/0/7/130739924/fizadoxav.pdf
    • http://files.carlahope.com/uploads/1/3/1/8/131871762/xobakeruruxu_sixukasikirade.pdf
    • http://files.innovationsbuildingservices.com/uploads/1/3/1/4/131438741/3ca2f8128cf.pdf
    • https://widojudi.files.wordpress.com/2020/07/fujavedalorezul.pdf
    • https://kiwuzuk.files.wordpress.com/2020/06/81452182364.pdf
    • https://zonekavaxed.files.wordpress.com/2020/06/21622920957.pdf
    • https://tugefipojux364575537.files.wordpress.com/2020/06/94513354305.pdf
    • https://manulut906331163.files.wordpress.com/2020/06/31132407867.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/3785448733.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/80278007767.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/59022585862.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/surorut.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/96226605796.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kefemomorevogik.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/72593533024.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_off00004da6.bin
a32321321642496d178d05cd7e62ead63263dead9cebab82490f52f6e9c6825b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4DA6 4908 bytes
font_01_sfnt_off00005e66.bin
1d27ccebb9b7d897feaec98ec1353af4b5c2d05c05b8e89a88bdc5a4a901f378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E66 9028 bytes

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