Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8c251029d60b7f4…

MALICIOUS

PDF

41.0 KB Created: 2020-08-17 09:25:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 2bb4263682306ef2972d0c8e4dc8eed9 SHA-1: 5abb2527f10d444680068563c8ba62dc2c0e3e1a SHA-256: c8c251029d60b7f4dec46a07ab8554eb4e84de3f548c4309ef1d89af16fc2dcf
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a critical heuristic for linking to known malicious redirector infrastructure via the URL https://ttraff.com/pify?keyword=single+dial+buttress+thread+form+gauge. Additionally, it contains a link farm pointing to numerous PDF files hosted on cdn.shopify.com and other domains. The ML classifier also strongly indicated maliciousness. The presence of a link farm suggests an attempt to obscure the final malicious destination or to distribute multiple lures.

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.com/pify?keyword=single+dial+buttress+thread+form+gauge In PDF document text
    • http://files.juheonlee.com/uploads/1/3/1/4/131452842/xezumegenarunojova.pdfIn PDF document text
    • http://poduv.crystalsgymnastics.org/uploads/1/3/0/8/130873995/3794328.pdfIn PDF document text
    • http://files.myspecialcrown.com/uploads/1/3/1/3/131380163/berugowelibi.pdfIn PDF document text
    • http://files.heartandminddevon.co.uk/uploads/1/3/2/6/132682701/4605415.pdfIn PDF document text
    • http://mulefed.litezone.ca/uploads/1/3/2/6/132681556/9425954.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/1/0429/7788/6367/files/debussy_syrinx_sheet_music.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2353/1175/files/mcdougal_littell_algebra_1_resource_book_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2328/6940/files/jofasofus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0555/8436/files/65870070553.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5253/1869/files/39610080798.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9482/6396/files/marriage_certificate_online_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8056/4392/files/examen_de_ingles_toefl.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2515/3698/files/horizontal_list_css.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/3006/7865/files/23672913233.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

Related samples 4

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000622b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x622B 5564 bytes
SHA-256: 4d21e3302fec5907ed00f2ddb4a02df182007abe00e53397f33e1ead648d85f1
font_01_sfnt_off000074e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74E0 10184 bytes
SHA-256: 52328f00696f69061d202678786c6fd6150187256beb1b644bbc8ee0baab403f

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