Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd826a1c3809e55e…

MALICIOUS

PDF

41.0 KB Created: 2020-08-12 06:10:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: c3840a241d23c3f5bfdde1ee389be248 SHA-1: d163de670bee1f6851dc69d8b16ac6febd686ef0 SHA-256: bd826a1c3809e55e5e6df4b0c0455dfcc636e6f09462aa55588063090b4310a1
194 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'ttraff.ru'. The document body, though heavily obfuscated, contains the same URL and text suggesting an IRS publication, likely a lure. The presence of a mass external PDF link farm further indicates a malicious intent to distribute content through deceptive means.

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=irs+publication+525+pdf In PDF document text
    • http://files.vanhornauctions.com/uploads/1/3/2/6/132683088/zizutaluwovejef-dijoxuk.pdfIn PDF document text
    • http://files.takeaclasswithlaura.com/uploads/1/3/1/4/131453684/1f777329.pdfIn PDF document text
    • http://files.doorway.org/uploads/1/3/0/7/130776499/tixizorozi.pdfIn PDF document text
    • http://files.lynnegobioff.com/uploads/1/3/0/7/130738988/3759835.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/1/0448/0902/7735/files/south_african_banking_industry_analysis_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6730/2295/files/sistemas_economicos_capitalismo_y_socialismo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rasamonuje.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8406/2622/files/dunukirumimulono.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2655/3755/files/46771001319.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2398/1979/files/fuzajirisorizun.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0926/1220/files/mvp-_pay._msxi._com.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9046/0324/files/uric_acid_test_kit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9769/4114/files/wordly_wise_3000_book_7_test.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6778/5884/files/65127092842.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_off0000611c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x611C 5480 bytes
SHA-256: b09e021460be512dc18b468c4b04647f031aa56388e18d66c3f4792a49667176
font_01_sfnt_off000073c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73C5 10544 bytes
SHA-256: 71cadee02f30bb34013597c6802a83e39c49793c9d0c75a48c70dc668dec4fec

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