Malicious PDF — malware analysis report

Static analysis result for SHA-256 22bcc4b3332ac1a1…

MALICIOUS

PDF

53.2 KB Created: 2020-10-01 22:07:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6e09a9743486284739ee40a01dae9d21 SHA-1: b0970445c9a770c267e27340c558caf79480b77a SHA-256: 22bcc4b3332ac1a14fe98c8b98ceac631d9ba40ffc7c2134c314e3a480f574b5
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of embedded links, many of which point to external PDF files hosted on domains that appear to be part of a link farm. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting a malicious intent to lead users to harmful content. The ML classifier also strongly indicated maliciousness.

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://ggtraff.ru/strik?keyword=radiohead+creep+sheet+music In PDF document text
    • http://jugudizo.theteccas.com/uploads/1/3/2/8/132814989/3234569.pdfIn PDF document text
    • http://files.r3dband.com/uploads/1/3/0/7/130775245/442a6d9dc.pdfIn PDF document text
    • http://files.victorialrudolph.com/uploads/1/3/0/8/130873709/kejeboxuzug.pdfIn PDF document text
    • http://files.happypianolessons.com/uploads/1/3/0/8/130813747/posotezenonexub.pdfIn PDF document text
    • http://pezinapi.souloving.com/uploads/1/3/0/8/130874431/boful.pdfIn PDF document text
    • http://files.slator-usa.com/uploads/1/3/0/8/130814390/217441.pdfIn PDF document text
    • http://terodanig.mikeflament.com/uploads/1/3/0/7/130775195/betakaxoresotu.pdfIn PDF document text
    • http://files.dallasooh.com/uploads/1/3/1/0/131071277/8983728.pdfIn PDF document text
    • http://kajotiz.highlandchristchurch.com/uploads/1/3/1/6/131637291/fugix.pdfIn PDF document text
    • https://site-1038343.mozfiles.com/files/1038343/vazisurajexidaxolo.pdfIn PDF document text
    • https://site-1036716.mozfiles.com/files/1036716/69535945501.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/1/0440/1197/8902/files/catfish_and_mandala_summary.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/2981/1359/files/alaskan_klee_kai_for_sale_pa.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_off000086d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86D0 5288 bytes
SHA-256: 61921210985ae82442169ad774947a2c026a7614a4fb1f0183e32b7b93d64523
font_01_sfnt_off000098a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x98A4 14580 bytes
SHA-256: 166b4ca2fa86289b95efdc5aa0fdca6fc9cfa5ec73bb12f16e17a868263604a0

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