Malicious PDF — malware analysis report

Static analysis result for SHA-256 719b753cf45ac50a…

MALICIOUS

PDF

47.1 KB Created: 2020-10-30 23:51:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 2f0749c5e292cff6396eca05febb7e0c SHA-1: 6a6d776a69f30f890207edc6dcf5fbb1944e4624 SHA-256: 719b753cf45ac50aceba8aaeb706351818254c30459ffd46919d83c19e816724
154 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including one pointing to known malicious redirector infrastructure at https://cctraff.ru/strik. The document body, though heavily obfuscated, contains this URL and other PDF links, suggesting a link farm or phishing lure. The ML classifier strongly flagged this PDF as malicious.

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=marquette+acceptance+rate+2017 In PDF document text
    • https://tugajepefur.weebly.com/uploads/1/3/1/4/131453805/5648081.pdfIn PDF document text
    • https://mobajexiv.weebly.com/uploads/1/3/4/4/134455683/8be45d17aa.pdfIn PDF document text
    • https://woruvewuz.weebly.com/uploads/1/3/4/4/134400058/5bd4481b4c3.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/1/0499/6094/3769/files/niwogibulunajametum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/672906a4-6439-4f1a-b942-63e0b5be3124/luwifutimojosevaponipozu.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/jozafitekekemuxupej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34e72f1b-0a74-44f7-abe7-c4afa3ba9724/ludupitadufofipiwejupinej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c46752a1-064a-4348-a474-ea55eca3715f/lutub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2613adba-9023-4a9d-822d-4c08a70ce265/773-_599-_0180.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/2315/7416/files/11775138047.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dcdc0c6-b207-4173-b0c7-f0a77870a83b/3469296779.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/hida_brownian_motion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe63eeaa-fd75-44f3-be7d-eb07390f82d1/63303518651.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_off000077e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77E7 5252 bytes
SHA-256: 211345cd59b44d0cc2391968337820debae54b7d8f73c24e50e36f2eaa2a0f47
font_01_sfnt_off000089f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89F3 11004 bytes
SHA-256: 46bbfadbc9ea7c10b8332eb3709a342ade0cd38c67aa4606672e17eaa7c30866

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