Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b27ab31880b0cc6…

MALICIOUS

PDF

45.7 KB Created: 2020-11-05 01:19:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: c9ffee406405f9a15de88faa5a701b3b SHA-1: 2f702bc9cbeb547c050bd94d9a6f1065b78f69b0 SHA-256: 0b27ab31880b0cc63961d66cf362536eb0d25b4b89900deeaf90cdadffc62c6b
194 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious redirector links and an SEO link farm, pointing to a phishing or malware distribution scheme. The embedded URL 'https://ggtraff.ru/strik?keyword=typical+word+length+novel' is identified as a malicious redirector. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest an attempt to redirect the user to a malicious site, likely for initial compromise.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=typical+word+length+novel In PDF document text
    • https://toxavikosas.weebly.com/uploads/1/3/4/4/134437834/rawijexevuxi.pdfIn PDF document text
    • https://sijevunima.weebly.com/uploads/1/3/1/8/131859613/gatixikanoferif.pdfIn PDF document text
    • https://tetoferapijala.weebly.com/uploads/1/3/1/6/131606168/pitev-lizivafofidebef-jogagisazal-xelajelini.pdfIn PDF document text
    • https://suxifobafip.weebly.com/uploads/1/3/4/3/134370270/1315c58148.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/1/0504/7359/9156/files/60690079115.pdfIn PDF document text
    • https://s3.amazonaws.com/zidenigad/north_scott_high_school_choir.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/8180/0090/files/michael_wolff_fire_and_fury_sequel.pdfIn PDF document text
    • https://s3.amazonaws.com/kotenu/dsc_1550_installation_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/827903250.pdfIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/tozasizatekegori.pdfIn PDF document text
    • https://s3.amazonaws.com/ratixifo/performance_appraisal_comments.pdfIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/endless_praise_lyrics_and_chords_by_planetshakers.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/bangla_job_application_letter_sample.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_off000074b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74B7 5360 bytes
SHA-256: bbcc4cdc4cb291bf4decf3edd0fa58f885c558f790a4b417ea38a1d5bbb83ab4
font_01_sfnt_off0000870b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x870B 10124 bytes
SHA-256: 4ada6eae756786f3a8bcc58c9f568d40d555d5ec945f6d69e8d64d2bc377c331

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