Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1e317e840606351…

MALICIOUS

PDF

44.0 KB Created: 2020-10-28 07:42:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: cdb21c90b5369b1576631fc2c13d3674 SHA-1: 365c008fe9daeae60fc8df7b006c79623f46fb05 SHA-256: c1e317e84060635115ad71f50cddf318eb0ec38c84ea677cb20847632fddc486
194 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to redirector infrastructure. The primary redirector URL is https://ttraff.link/123?keyword=safe+flash+game+websites, which is flagged as malicious. This suggests the document is part of a link farm or SEO poisoning campaign designed to trick users into visiting malicious sites under the guise of providing useful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.link/123?keyword=safe+flash+game+websites In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368970/normal_5f8b5d97dd271.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408478/normal_5f947f44e793b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365525/normal_5f8cfb8da89ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369166/normal_5f8b94aa4d813.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413697/normal_5f94aac1bd775.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409811/normal_5f94d4c6e8a7b.pdfIn PDF document text
    • https://lipowuripipu.weebly.com/uploads/1/3/1/3/131378852/dce22b3ddeb7.pdfIn PDF document text
    • https://ligofaxudatejot.weebly.com/uploads/1/3/0/7/130739538/towufulupumug.pdfIn PDF document text
    • https://bogadisosupotaj.weebly.com/uploads/1/3/0/7/130776541/9398828.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394072/normal_5f98c4a489351.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369786/normal_5f924f96bd626.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367007/normal_5f87319053080.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372719/normal_5f88cdfded4a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365607/normal_5f87a07cd88ff.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1d0d51e-0ec6-4e5f-a146-63fc86b3c687/vopuzagokaxilofokesa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73e3dcb3-57d0-44d9-a52b-ed6ae75f933e/stream_hunger_games_movies_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db5f0f10-f75c-4c75-a22b-a28340856a1b/diabete_gestationnel_2017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bbc9f03-cea6-4a9b-8b55-ca42534a201e/82783607350.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_off00006ca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CA7 5420 bytes
SHA-256: 743545a768346d0cafe6765d1c4c4922e0d8f17420eac2b064056fcb573720b2
font_01_sfnt_off00007f10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F10 10364 bytes
SHA-256: b419c165e7d5530a85e0107e00be89422463fddeb08460107932506e24967f72