Malicious PDF — malware analysis report

Static analysis result for SHA-256 9caf82cfd93749f0…

MALICIOUS

PDF

42.0 KB Created: 2020-08-20 21:04:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 051ec592abd070b6dc137b098e114861 SHA-1: 866477ef302e50cc86f547f4e38350d8fd065e56 SHA-256: 9caf82cfd93749f046807a97124c5a0b902daade425e00ceb7aba5239b2d9554
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded links, identified as a PDF link farm. One critical heuristic indicates a malicious redirector link pointing to 'ttraff.cc'. The document body, though heavily obfuscated, contains text related to 'cvc word families worksheets' and also includes the malicious redirector URL and several other PDF URLs, some hosted on Shopify. The ML classifier also flagged this PDF with high confidence.

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.cc/pify?keyword=cvc+word+families+worksheets In PDF document text
    • http://files.uprisingstarsinc.org/uploads/1/3/1/3/131379045/gowofikur.pdfIn PDF document text
    • http://diradas.missionm4.org/uploads/1/3/1/4/131406286/liforobivovig-kusip.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/1/0429/2083/7279/files/unire_file_i_love.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1795/9586/files/free_amharic_fiction_books_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0763/9711/files/gesidipabidupufu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8382/4294/files/76316316836.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2080/4511/files/tezeferu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6188/6627/files/24701050253.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3074/8055/files/kibavizurunu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4681/4374/files/the_butterfly_effect._torrent.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fuwemosuwizukuxitakalav.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4875/4600/files/intraday_liquidity_reporting_swift.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 8

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B5D 5380 bytes
SHA-256: 667d333d785247978d51885c0023a97035b0911e9a7495cfa2ce27f2e0b7f66d
font_01_sfnt_off00006d8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D8C 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off0000761a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x761A 11516 bytes
SHA-256: 51019a519959edf9135a5e5c0ff2504d1aa61ce52f7e49d1a512f926266dfe06

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