Malicious PDF — malware analysis report

Static analysis result for SHA-256 839314025395abfd…

MALICIOUS

PDF

40.0 KB Created: 2020-10-04 04:44:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 738ef8151cf31d3d39bdcd1ab27a4a71 SHA-1: 754b1f1a9817bc7d3ee90b821c1e6e9b114b3743 SHA-256: 839314025395abfdc2b98c0d8376033116630b6d0047a3c157afdefd2039881f
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of embedded links, many of which point to disposable hosting domains and appear to be part of a link farm. One of the primary links, https://cctraff.ru/strik, is identified as a malicious redirector, indicating a high likelihood of leading users to malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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://cctraff.ru/strik?keyword=angles+of+depression+and+elevation+worksheet+answer In PDF document text
    • http://files.bistihiker.com/uploads/1/3/1/4/131407655/jodis.pdfIn PDF document text
    • http://vukuwiriz.thepromiselandcamp.com/uploads/1/3/1/4/131452977/3953a7dbd9d3.pdfIn PDF document text
    • http://files.billvliek.com/uploads/1/3/1/8/131858592/a8e7e418113.pdfIn PDF document text
    • https://site-1036716.mozfiles.com/files/1036716/84269887404.pdfIn PDF document text
    • http://rowejeg.circleschools.org/uploads/1/3/0/8/130874620/94664d4aaea5e47.pdfIn PDF document text
    • http://sofozebol.anneduffforeducation.com/uploads/1/3/1/0/131070493/wavepimakoxida_bevofinu_gadulegujab.pdfIn PDF document text
    • http://files.kasey-murdock.com/uploads/1/3/0/7/130775537/rovitibibarokajos.pdfIn PDF document text
    • http://rudubelup.thriftbox.org/uploads/1/3/1/3/131398274/tozexomes_bulorago.pdfIn PDF document text
    • http://wuxutik.longford.coralleisure.ie/uploads/1/3/1/3/131398101/c7cbc4c68559cf1.pdfIn PDF document text
    • http://saporavo.septicserviceshunstville.com/uploads/1/3/0/7/130775997/26bd9c95a63d8a.pdfIn PDF document text
    • http://jetol.rawdeal-wi.com/uploads/1/3/0/8/130813651/xokonon.pdfIn PDF document text
    • http://files.non-disneyinternationaldubbingcredits.com/uploads/1/3/0/9/130968943/633d0454e42c.pdfIn PDF document text
    • http://nuzop.byrongreenwood101.com/uploads/1/3/0/7/130776257/zovize-dekatilefigog.pdfIn PDF document text
    • http://kabegafod.northvicgps.com/uploads/1/3/0/7/130740117/nuwuz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00005e0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E0F 5508 bytes
SHA-256: 91ad88c5040d32e2d014102db5229a6fd527ec5e79bb40d38efabd223abd6699
font_01_sfnt_off000070e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70E3 9968 bytes
SHA-256: 9e9472d8647f88291553756581c554c7750ab82269aab3db62bca304eb8cd210

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