Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a33bf318b34480c…

MALICIOUS

PDF

36.3 KB Created: 2020-10-30 06:23:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: f0b52f7506cdaa9f817920d5daf8a35f SHA-1: 3c80982498653b79261200e2c75afd2fc238ca83 SHA-256: 5a33bf318b34480c7672bf3c9eecfa0cfd25fdb35940cf5a1d8a58eada90d310
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body text, though garbled, includes keywords related to funeral homes, suggesting a social engineering lure. The ML classifier also strongly flagged this PDF as malicious, indicating a high probability of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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 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.cc/pify?keyword=johnson+funeral+home+thief+river+falls In PDF document text
    • https://rojusonevupa.weebly.com/uploads/1/3/0/8/130814232/zugalira.pdfIn PDF document text
    • https://gumoxeladupeguv.weebly.com/uploads/1/3/4/3/134318886/a8ff5f56885.pdfIn PDF document text
    • https://xogexemufak.weebly.com/uploads/1/3/1/4/131437987/4025374.pdfIn PDF document text
    • https://vilujelirajoki.weebly.com/uploads/1/3/4/3/134378771/vunos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381090/normal_5f9468aa75e12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412195/normal_5f94931e36d11.pdfIn PDF document text
    • https://wetuxabo.weebly.com/uploads/1/3/0/8/130873937/wufawijawudu_bupedala.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408702/normal_5f99bb54bad28.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/1/0486/4573/4568/files/maxifakofijajevawuwetimo.pdfIn PDF document text
    • https://s3.amazonaws.com/xipavir/zovafen.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/nopezixe.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_off00004f96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4F96 5056 bytes
SHA-256: 16b538c55ebfbb665ff63441d5b2c5b932e9109c1ffbc2d60405b58b1fe7cd70
font_01_sfnt_off000060a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60A3 10592 bytes
SHA-256: 12ed9ae19f3eb76086f9a06dd403c2ba45b198d5340a2e3b163bc3bb0a528142

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