Malicious PDF — malware analysis report

Static analysis result for SHA-256 77a665f15b507643…

MALICIOUS

PDF

43.0 KB Created: 2020-09-30 01:46:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 20aa6ab1496e455da3863d95fd76c5b5 SHA-1: 78ec118a316e4f9db5f0bba47a4c10b6c2ce7c0a SHA-256: 77a665f15b507643b9677180497b181f007b9f399b3a6b0d1d7bfe517cef2333
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, with the primary one redirecting to a malicious domain. This suggests the document is designed to act as a link farm, potentially for SEO poisoning or phishing, by directing users to malicious infrastructure. The ML classifier also strongly indicated maliciousness.

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 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.
  • 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://cctraff.ru/strik?keyword=business+communication+process+product+9th+edition+pdf In PDF document text
    • http://josuwak.artoffood.org/uploads/1/3/1/4/131452869/zijoxarilivir-nisisofok.pdfIn PDF document text
    • http://files.sarahkramerharrison.com/uploads/1/3/1/4/131437322/lesom.pdfIn PDF document text
    • http://files.drsjbd.com/uploads/1/3/1/3/131382113/fovip-gisudofalesedub-zefoxixojigukex.pdfIn PDF document text
    • http://rimoreluj.moosethemorkie.com/uploads/1/3/0/8/130874566/wesijitu.pdfIn PDF document text
    • http://files.stewardstation.org/uploads/1/3/1/4/131437756/birosi.pdfIn PDF document text
    • http://files.marywillock.net/uploads/1/3/1/8/131857421/6faa43c60cee.pdfIn PDF document text
    • http://sizozal.missgish.com/uploads/1/3/2/7/132740366/3322072.pdfIn PDF document text
    • http://zisafeza.jakyoga.com/uploads/1/3/2/6/132696056/sajaxitar_putibex_mazibogobavufu_fudapasemixa.pdfIn PDF document text
    • http://files.fyrelandcanecorsos.com/uploads/1/3/0/7/130738641/wuminoz_vazeferis_wegawata.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/1/0431/8996/0865/files/32027972250.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/3698/0886/files/kaththi_tamil_full_movie_tamilyogi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7026/6273/files/vogelasor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/9345/3720/files/iowa_court_of_appeals_decisions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/0177/2192/files/25250943566.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa89b56c-2131-413a-b9b2-6dacfbca6514/wumilunumabopiparera.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6027ed2-e7e8-4788-b1b9-3f50c57471c8/vojogit.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_off00006673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6673 5568 bytes
SHA-256: 887015d77c5e84854ee6d7ee18a9bd8560592fa12526e145e419a389177c009d
font_01_sfnt_off00007939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7939 10912 bytes
SHA-256: 8315d0e234197aebe8eca390e005b544cdf90282872b9e63cc39a4ed99f1370e

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