Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9d69b52a4cf3aa5…

MALICIOUS

PDF

42.5 KB Created: 2020-10-01 07:44:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a6e9cad2010b6d95faee4d3aefcd100c SHA-1: fb467c0c3f5b5c3f1fc20d0d97c740a73b443368 SHA-256: b9d69b52a4cf3aa5ccbb1255d2b99897dfa4beafc997a8e1f6b00d74d1200a6d
184 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to disposable hosting or redirector infrastructure. One critical heuristic identified a link to known malicious redirector infrastructure at `https://gettraff.ru/strik?keyword=medial+epicondylitis+surgery+pdf`. The document body, though heavily obfuscated, also contains this URL, suggesting the primary purpose is to lure users to malicious sites.

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=medial+epicondylitis+surgery+pdf In PDF document text
    • https://site-1038980.mozfiles.com/files/1038980/vuxebufasu.pdfIn PDF document text
    • https://site-1036816.mozfiles.com/files/1036816/68531963168.pdfIn PDF document text
    • https://site-1037222.mozfiles.com/files/1037222/65165145114.pdfIn PDF document text
    • http://vogug.blackfishglass.com/uploads/1/3/1/4/131483222/pizipaxiwavegibe.pdfIn PDF document text
    • http://zigate.stallionscouts.org/uploads/1/3/1/1/131164250/teforo_jovigenufu_witeles_dipogasisavi.pdfIn PDF document text
    • http://files.totalmarinegippsland.com.au/uploads/1/3/0/7/130739488/bogufopikiwanix.pdfIn PDF document text
    • http://mogodaze.newthaiart.com/uploads/1/3/1/4/131454215/8653989.pdfIn PDF document text
    • http://files.nicelydonemagick.com/uploads/1/3/1/4/131406849/a28032fed.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/1/0431/8615/9767/files/hyster_forklift_manual_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3631/0693/files/20068292653.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0463/3614/7612/files/intro_to_java_programming_liang_10th.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96e514b6-e388-44e7-aa43-7d7ef8a97eda/38000571217.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70190d31-1c33-41bd-9368-d06f788518ca/rerusujexugixajerudumekor.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_off00006748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6748 5432 bytes
SHA-256: fa3841651326ca2361090141913bbf831dcc82e35189a885818f19c3374f4173
font_01_sfnt_off000079e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79E7 10304 bytes
SHA-256: 68af898d68cf3ce58efb22bf62551980b0c1a3c8702bfa59acd37a30b130b406

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