Malicious PDF — malware analysis report

Static analysis result for SHA-256 33ae55570a293353…

MALICIOUS

PDF

46.5 KB Created: 2020-11-01 03:58:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: c7155f0b42793221808a8bf4f26112a1 SHA-1: 9a45344d115475dd8e556d922480e6c18018540e SHA-256: 33ae55570a2933530b11d2fe7897ae9e86a9502d1f9215cf9d2367ac2810fbee
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.007 JavaScript

The PDF file contains embedded links and text that mimic a "Windows script host error" to socially engineer the user into clicking a malicious URL. The heuristic 'SE_CLICKFIX' specifically indicates that the document instructs the user to press Win+R or paste a command, which is a common tactic to bypass macro restrictions and directly execute malicious content. The ML classifier also strongly flagged this PDF as malicious.

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.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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/pify?keyword=windows+script+host+error+800a000d In PDF document text
    • https://lesajevix.weebly.com/uploads/1/3/4/3/134318042/xakupomolim_garagiwubero_nalowu_renapabe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369783/normal_5f91936b47b23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412160/normal_5f95b8d562f25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371013/normal_5f8fc83699478.pdfIn PDF document text
    • https://megeleju.weebly.com/uploads/1/3/4/3/134319984/372071.pdfIn PDF document text
    • https://raxabebawozovi.weebly.com/uploads/1/3/4/3/134311701/voliduvenebaxonix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386080/normal_5f985dd7f217c.pdfIn PDF document text
    • https://jedujidiki.weebly.com/uploads/1/3/4/3/134352610/mirexofukeno_sulifutusafi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380237/normal_5f95cb73bb7fe.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/mikukinib.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gedimuta/97415049201.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0507/4976/7880/files/23981822217.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/multiplication_worksheets_year_4.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5471/8358/files/epic_games_friends_shortcut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5812d8b0-2bdf-4080-b0e4-e4a085048a89/pavilions_at_pantano_hours.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_off000072e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72E4 5572 bytes
SHA-256: b3422a8c03eb0b9da7998f4199bc252565cb3504cf6ea83a5c71f5d482436d50
font_01_sfnt_off000085f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85F0 11412 bytes
SHA-256: 9921e647010c0eadcbe216836cf127ba1b48a49636061d136179eac53e4a999f

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