Malicious PDF — malware analysis report

Static analysis result for SHA-256 66316df053380276…

MALICIOUS

PDF

39.8 KB Created: 2020-08-04 10:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 3aae073fa6845097db6a8292d495e8bd SHA-1: 4af91e8e1067b202a8e698cd293aa06801ceedb3 SHA-256: 66316df053380276112786527cddf20a065d9a539cc45c8592b57451a2661e74
194 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to a redirector service (ttraff.ru) disguised as a search result for an exam paper. This suggests a phishing or content-luring attack. The ML classifier strongly flagged this PDF as malicious, and heuristics indicate it's a redirector link farm designed to obscure the ultimate destination. No scripts were extracted, but the embedded links are the primary indicators of malicious intent.

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.ru/pify?keyword=upsc+cds+2+2020+question+paper+pdf In PDF document text
    • http://files.gildatgarbanzos.org/uploads/1/3/2/6/132681474/aef2e7f82.pdfIn PDF document text
    • http://fuduxate.mystreetstamp.com/uploads/1/3/1/0/131070849/vezujele_kimowipemasez_biluvijafam_dafiroje.pdfIn PDF document text
    • http://files.sydneyinsightmeditators.org/uploads/1/3/1/3/131381976/1be572.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/1/0431/5742/2229/files/delimuke.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6964/3675/files/bubble_tanks_unblocked.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4639/5304/files/3000849971.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7182/3262/files/47666645843.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4718/1718/files/68987099800.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8167/8494/files/22190018632.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/58933331969.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7236/4437/files/rumaviwupeziwenugamibu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0962/2687/files/google_sheets_duplicate_row.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7593/5135/files/jorujomodilerimawimobub.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1510/9794/files/nupurugewi.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 6

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_off00005c42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C42 5508 bytes
SHA-256: 70a09078c8f2e57c985630035feab20f0273d6cdff3e072e51b61f6d87252f76
font_01_sfnt_off00006f0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F0B 10472 bytes
SHA-256: cc5862cf98bad98e44462b7fd213a08ccbf2d1b7dbc04ecc306e6acd60115c5f

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