Malicious PDF — malware analysis report

Static analysis result for SHA-256 0224fcfd2b2d568c…

MALICIOUS

PDF

41.4 KB Created: 2020-07-09 18:15:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-08-25
MD5: 620ffea519c5c75c6979869c2bb8457e SHA-1: c405c86e1be11732929d15c88555fe5369c56e4c SHA-256: 0224fcfd2b2d568c983107754803a4a7e0c4790f6edad7e511953c4716228d37
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to disposable domains, which is characteristic of SEO link farms or phishing lures. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains URLs that are also present in the heuristic findings, reinforcing the malicious intent.

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://ttraff.ru/wb?keyword=life%20cycle%20of%20nematodes%20pdf In PDF document text
    • http://files.centrocha.org/uploads/1/3/0/8/130873870/7918256.pdfIn PDF document text
    • http://files.nephro-pathology.com/uploads/1/3/1/3/131398171/b88136316.pdfIn PDF document text
    • http://files.hullabaloomusicfestival.com/uploads/1/3/2/7/132740415/zikomigop.pdfIn PDF document text
    • http://files.stephanieclaus.com/uploads/1/3/1/8/131858043/08f28983.pdfIn PDF document text
    • http://files.urfellowship.com/uploads/1/3/0/8/130813305/9688921.pdfIn PDF document text
    • http://files.cvhsaa.org/uploads/1/3/0/8/130874295/nutolimijiwu.pdfIn PDF document text
    • http://files.match-gems.com/uploads/1/3/0/9/130969243/waruxe-gibotusupuwe-viputefetapaj-walugogigebomev.pdfIn PDF document text
    • http://files.valleyrootsfoodhub.com/uploads/1/3/0/7/130740344/fa8b50ce.pdfIn PDF document text
    • http://files.anudebating.com/uploads/1/3/0/8/130814280/zodeworok-surezek-vuvuvagi-pazetovisides.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dixurozazix.files.wordpress.com/2020/06/51746671016.pdfIn PDF document text
    • https://kovevaso.files.wordpress.com/2020/06/62204530262.pdfIn PDF document text
    • https://nobagonaba.files.wordpress.com/2020/07/xekorimopobusavesex.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/12339474235.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/45035229099.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tikumakosesik.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65CD 5036 bytes
SHA-256: e9998676132ec57343b81c44242355fb7baab804d18325014398286149e19d2f
font_01_sfnt_off000076dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76DC 10008 bytes
SHA-256: 946ca7c519b822ca15e0951fbe082314629435eb8907e659b121f3551d65d467

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