Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b851db5b93d278b…

MALICIOUS

PDF

35.7 KB Created: 2020-09-29 18:46:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6c881a756170e0f39f298940c33deb8b SHA-1: d37d8ed02debf3fb317d6d85505ae015911cab92 SHA-256: 2b851db5b93d278bd5c6a5e8ff4b015fad5ea5790d33d6ad19743c1862a81c7a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO poisoning tactic. One prominent URL, https://gettraff.ru/strik?keyword=atlas+of+electrocardiography+k+wang+pdf, is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL and other Shopify links, reinforcing the malicious redirector's purpose. The ML classifier also strongly indicated maliciousness.

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://gettraff.ru/strik?keyword=atlas+of+electrocardiography+k+wang+pdf In PDF document text
    • http://tivoj.aqeek.com/uploads/1/3/1/0/131071145/wemadubivudejo.pdfIn PDF document text
    • http://files.preschoolcorner.com/uploads/1/3/0/8/130873930/zawilorifofilaj.pdfIn PDF document text
    • http://wepabewo.londonsustainableschools.org/uploads/1/3/0/9/130969114/c699ae2c74066be.pdfIn PDF document text
    • http://xejolasu.aittransmission.com/uploads/1/3/2/6/132681490/4755927.pdfIn PDF document text
    • https://site-1037222.mozfiles.com/files/1037222/36994105853.pdfIn PDF document text
    • https://site-1037187.mozfiles.com/files/1037187/vazujibegovafiseli.pdfIn PDF document text
    • https://site-1037022.mozfiles.com/files/1037022/50944837262.pdfIn PDF document text
    • https://site-1036981.mozfiles.com/files/1036981/valunadedavipa.pdfIn PDF document text
    • https://site-1036951.mozfiles.com/files/1036951/49299516826.pdfIn PDF document text
    • http://xosabi.lyrikalstorm.org/uploads/1/3/1/3/131378960/modotomukesilozemoxe.pdfIn PDF document text
    • http://files.missamericanprestige.com/uploads/1/3/2/7/132711999/zuniladonunix.pdfIn PDF document text
    • http://files.beinghumaninstem.com/uploads/1/3/1/3/131379510/xenap.pdfIn PDF document text
    • http://files.adameccleston.net/uploads/1/3/1/4/131411596/1394e81fcefd8c2.pdfIn PDF document text
    • http://files.aaandc.org/uploads/1/3/1/3/131381103/4253755.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0448/3871/5552/files/usps_practice_test.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4636/2533/files/kudekuwovopi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/2947/7014/files/craig_bluetooth_speaker_review.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5101/5577/files/bulelovalifeletaku.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004c81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4C81 5664 bytes
SHA-256: 6947e5a49f8b128864e5a9fc2d3ad029204b2d7615dad47ec6b8437bf175e25c
font_01_sfnt_off00005fdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FDF 9828 bytes
SHA-256: 6d80e64aca91242cffcc284ab0bf49e35f4706992e5dd3d5473d3db294229e13

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