Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb350a1e7a80f05f…

MALICIOUS

PDF

49.2 KB Created: 2020-11-01 03:04:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: b03d031f23a4d13de1517d6a382229d1 SHA-1: 39f0b0222c333f7d2d91dfd247ed69202bd9f40c SHA-256: bb350a1e7a80f05fd81435bed55e0d5bb04b0ae4d489145b7def7b380d2efb81
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous embedded links, including one that redirects to known malicious infrastructure. The document body itself appears to be malformed or obfuscated, but the presence of a malicious redirector and a large number of external PDF links strongly suggests a phishing or redirection attempt. The ML classifier also flagged this PDF with high confidence.

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=the+supersizers+go+regency In PDF document text
    • https://dokodajibebabek.weebly.com/uploads/1/3/2/3/132302773/5124095.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379733/normal_5f9182806fd50.pdfIn PDF document text
    • https://zabugusu.weebly.com/uploads/1/3/4/3/134311035/ef745a3f66f8b04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384167/normal_5f952b952bf7e.pdfIn PDF document text
    • https://sokuvotaboraj.weebly.com/uploads/1/3/0/7/130776263/dosapisobi.pdfIn PDF document text
    • https://wojeribexojuxu.weebly.com/uploads/1/3/1/8/131856158/daff31.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/1/0500/9057/3987/files/77268566378.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bde9577e-773a-40cd-b427-59d0d5b95efc/fatozi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/8696/1568/files/toxak.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8691/2413/files/nutcracker_piano_sheet_music_easy.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/9270/3915/files/old_school_rs_fletching_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/zepifudoxapo/pokemon_hack_apk_mod.pdfIn PDF document text
    • https://s3.amazonaws.com/sefukirexuwekij/24358568381.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_off0000834a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x834A 5056 bytes
SHA-256: cae5ff61579069001c8f5aad5263a433f293bed0c7103ed73ccbce04ab94faec
font_01_sfnt_off00009491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9491 10604 bytes
SHA-256: a8da4fec15ce1aec0db8838473d1d3181a7606522abf44fa2ff79611f28530c6

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