Malicious PDF — malware analysis report

Static analysis result for SHA-256 a78208ab7ae7946e…

MALICIOUS

PDF

44.6 KB Created: 2020-09-30 17:22:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 70f526d38fd7b49ba61f92b65a7b1ea9 SHA-1: 89509e8cf2f7955e9d5e8c3d179b6f8f0aa8f53a SHA-256: a78208ab7ae7946e1336180a795a3f391c6c5b4deb2ffb93b4f87323764c8ca0
184 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to disposable hosting services and are likely part of a link farm. One of the URLs, 'https://gettraff.ru/strik?keyword=waste+disposal+system+pdf', is identified as a known malicious redirector. The ML classifier also flagged this PDF with high confidence, suggesting malicious intent. No scripts were extracted, but the structure and embedded links indicate a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=waste+disposal+system+pdf In PDF document text
    • https://site-1036962.mozfiles.com/files/1036962/noferezegiwo.pdfIn PDF document text
    • https://site-1037864.mozfiles.com/files/1037864/wibegenenavogadanenunabu.pdfIn PDF document text
    • https://site-1037261.mozfiles.com/files/1037261/97017617469.pdfIn PDF document text
    • https://site-1036851.mozfiles.com/files/1036851/bomenakiju.pdfIn PDF document text
    • https://site-1037856.mozfiles.com/files/1037856/58126290722.pdfIn PDF document text
    • http://bogexum.yourplacetoheal.com/uploads/1/3/0/9/130969686/nutixet.pdfIn PDF document text
    • http://zijaf.ccepotomac.org/uploads/1/3/1/8/131857120/4922037.pdfIn PDF document text
    • http://files.frankfarina.net/uploads/1/3/0/8/130873997/598424.pdfIn PDF document text
    • http://files.specialtiesgames.com/uploads/1/3/2/6/132696067/juwad-sodudinevukala.pdfIn PDF document text
    • http://tudipo.fedsrn.org/uploads/1/3/1/3/131382982/sonewew-xodalagip-mevabotep-sukizagadagelu.pdfIn PDF document text
    • http://liduj.english.romekjanowskisvd.pl/uploads/1/3/2/7/132740366/4821276.pdfIn PDF document text
    • http://fosovetot.keneuoe.com/uploads/1/3/2/6/132681824/965cf3f.pdfIn PDF document text
    • http://lukaluz.bassistik.com/uploads/1/3/2/7/132712661/namuwukefegefa.pdfIn PDF document text
    • http://files.masonkelso.com/uploads/1/3/1/1/131163920/vevig-jekemo-zixinazaroj.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/1/0429/3486/1987/files/zomutowuxotuk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7044/5973/files/rilasulukilamuwunutibipa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0464/7498/5640/files/dialysis_unit_guide.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_off00006fde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FDE 5208 bytes
SHA-256: 3084440056a47831b2421af2ea6defa787006dc97cf3304071461c15b677b943
font_01_sfnt_off0000819f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x819F 10592 bytes
SHA-256: 34e571bd06c872e2bcad481fe08ae9d1f6ec32668e79339293692052c0d18128

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