Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef5e3b9e830ea524…

MALICIOUS

PDF

37.5 KB Created: 2020-10-07 00:43:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 30d78661ac121430efbf2edfaab4d6cd SHA-1: 3f94c5c6365bf2e64c1a602b56b93fd838ce12b7 SHA-256: ef5e3b9e830ea5244575fd42fa0ca50cf0bc6e0f0de247c2bbd72be6fe34579f
184 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, specifically for containing a large link farm pointing to potentially malicious or SEO-manipulated content. The presence of a link to a known malicious redirector, https://cctraff.ru/strik?keyword=baermann+clarinet+scales+pdf, further supports this assessment. While no scripts were directly extracted, the document body contains numerous URLs, indicating a primary function of directing users to external resources.

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=baermann+clarinet+scales+pdf In PDF document text
    • http://bomividem.shadhickmanrhs.com/uploads/1/3/1/6/131606218/3cddd.pdfIn PDF document text
    • http://files.thesilentseed.com/uploads/1/3/1/3/131380308/620a425a.pdfIn PDF document text
    • http://nilogete.magicartsstudio.com/uploads/1/3/1/0/131069935/eac7ff.pdfIn PDF document text
    • http://lotaxete.lvlimos.net/uploads/1/3/1/0/131070356/gevarixure.pdfIn PDF document text
    • https://site-1037846.mozfiles.com/files/1037846/92711737467.pdfIn PDF document text
    • http://naxapab.southarkansassports.com/uploads/1/3/1/4/131483065/totemabolozugamu.pdfIn PDF document text
    • http://sumubuwe.emmalouisesculpture.com/uploads/1/3/0/8/130813799/9359145.pdfIn PDF document text
    • http://files.ouhpsoc.org/uploads/1/3/0/7/130776371/4fc2170b2c.pdfIn PDF document text
    • http://sexuzik.fraudcamp.com/uploads/1/3/1/8/131871674/warolabeku-pogijigevirije-pekikukukulugo.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/1/0496/6239/4517/files/581409639.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0659/0119/files/latex_hood_pattern.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0488/3500/2533/files/kenneth_e._hagin_healing.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/1896/4122/files/pusufavib.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/0755/5222/files/zogetefiwutarob.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_off0000553f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x553F 5348 bytes
SHA-256: 8073a461d14d9ef72c8a00cd36e9e1a0cd00da5702d1a7aeeb9b2f1a13ca28e6
font_01_sfnt_off00006755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6755 10028 bytes
SHA-256: 4d8b54dc35a6ad82486a483091cc5667b76e26f9204ccbc7f3f5e56fd6afb5a9

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