Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a4b340f3c9a064a…

MALICIOUS

PDF

42.0 KB Created: 2020-10-31 11:46:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 6cb5ddb313be133b213f07da2ec4a8c8 SHA-1: eecce1d1a83cd105c1d51cd00e3052149e70d12c SHA-256: 0a4b340f3c9a064a1d7ac4515a6f201915c5624e64186c85e12e88d5eb3ce044
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous links, including one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL https://ttraff.me/pify?keyword=words+with+the+letter+z, which is likely intended to lead the user to a malicious site. The presence of a large number of external PDF links suggests a link farm or SEO poisoning attempt, further indicating 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 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://ttraff.me/pify?keyword=words+with+the+letter+z In PDF document text
    • https://cdn-cms.f-static.net/uploads/4387420/normal_5f964951e52e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388405/normal_5f99a2f7b6648.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383792/normal_5f8d48ce3441b.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/sugaguxagu/99609948417.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/7673/7955/files/pibazosixeziwupa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1321b6c7-0faa-41e8-aa70-44646054f83f/kijekojexetot.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/2502/8504/files/gazegixokejumaroxuvimol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb0b148c-092f-4954-b67e-b1dff6ee4e94/15914871270.pdfIn PDF document text
    • https://s3.amazonaws.com/tizowodifi/bytes_conversion_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a0ad8a1-af44-4384-9c63-bb26e0f2fa06/73610167391.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c729173d-9580-4604-b379-6eca212eb5b3/dipukilanuregaradi.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_off00006693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6693 4856 bytes
SHA-256: d5a1c46fcef6b201c10e3fb71fb2feb1fad8577887924cac467c2e33bbc1cfcf
font_01_sfnt_off0000772d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x772D 10640 bytes
SHA-256: fe388439d513d0bcaeb6ec8aa30beb525c728edd03068a7ff4c02d663eaa175f

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