Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e8c1e6f4f492f08…

MALICIOUS

PDF

46.6 KB Created: 2020-08-16 11:58:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf6cb7bda59624a58a2470ac2f3d6e88 SHA-1: eaedd5a7d3d4bd34916e3c7452a29736f8179255 SHA-256: 2e8c1e6f4f492f0851d52fc4675bde0bb49eccd7d5ffd429ca990f6a612671b0
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com, and one critical link to a known malicious redirector at ttraff.ru. The ML classifier strongly indicated maliciousness, and the PDF structure suggests an attempt to manipulate search engine results or distribute malware via a link farm. The document body itself is heavily corrupted but contains the malicious URL.

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/pify?keyword=rational+numbers+class+8+worksheet+with+answers
    • http://files.ethnictails.com/uploads/1/3/0/7/130775859/bilisudufojipe-sapawununamiw-tatawuzodij-jixid.pdf
    • http://vagoxuw.preciousbeginnings.info/uploads/1/3/0/8/130874493/518509.pdf
    • http://files.coyleparker.com/uploads/1/3/1/4/131437669/8649752.pdf
    • http://files.upstateyorkiesandmorkies.com/uploads/1/3/0/7/130739084/berusosikabak.pdf
    • http://files.philanthropyadvisorsny.org/uploads/1/3/1/3/131379830/6234097.pdf
    • https://cdn.shopify.com/s/files/1/0438/2107/2546/files/urticaria_treatment_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0433/6982/4414/files/37545237187.pdf
    • https://cdn.shopify.com/s/files/1/0431/1311/9905/files/41554850452.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/51906755497.pdf
    • https://cdn.shopify.com/s/files/1/0448/4582/6210/files/14854857697.pdf
    • https://cdn.shopify.com/s/files/1/0434/2297/4117/files/nimatited.pdf
    • https://cdn.shopify.com/s/files/1/0434/5751/1590/files/32688110893.pdf
    • https://cdn.shopify.com/s/files/1/0430/0180/7007/files/vagopokomutiwologovek.pdf
    • https://cdn.shopify.com/s/files/1/0433/4557/6088/files/nirusud.pdf
    • https://cdn.shopify.com/s/files/1/0430/7792/7063/files/ganer.pdf
    • https://cdn.shopify.com/s/files/1/0436/9963/4330/files/certificate_of_conformity_mercedes_uk.pdf
    • https://cdn.shopify.com/s/files/1/0431/0404/3170/files/kexobafitufisevilagadeki.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d76.bin
f5bb7f09ebccbb6e9c4e25d4a5388ee411f35297e7b698dea34f1193cca511eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D76 5536 bytes
font_01_sfnt_off0000702b.bin
28b21d1f205cc52ce742af1d068450b60d87b95736af3dca8805bb11ce62a4ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x702B 12324 bytes
font_02_sfnt_off000097a0.bin
6e3fbd491d8b71441998836ddca0d0c102716a221ea14f8143929167ad9a79b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97A0 16164 bytes

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