Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5c558c7834220ab…

MALICIOUS

PDF

54.1 KB Created: 2020-08-10 18:01:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 3f4e2b6e9d60fe870b93e6d9fd715ff3 SHA-1: a5cde989abb9058087c02f0dcc16a19638ab5f13 SHA-256: d5c558c7834220ab5bafe2f9f7dca78835317927add7ebfdaa38190ca5cb2566
194 Risk Score

Malware Insights

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

The PDF file was identified as malicious due to a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it points to known malicious redirector infrastructure. Additionally, the PDF_SEO_LINK_FARM heuristic fired, revealing a large number of embedded external links, with the primary malicious URL being https://ttraff.ru/pify?keyword=canadian+solar+hiku+pdf. The document body contains garbled text but also includes several URLs, reinforcing the link farm finding. The presence of these numerous links suggests a phishing or malware distribution attempt.

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=canadian+solar+hiku+pdf In PDF document text
    • http://sebaf.commercialbondstexas.com/uploads/1/3/1/8/131871462/rojegekepaxigutuz.pdfIn PDF document text
    • http://zudazup.robynrice.com/uploads/1/3/0/7/130776485/wepuj.pdfIn PDF document text
    • http://files.gourmetw.com/uploads/1/3/0/9/130969700/kidupiwaguvida-vonawemizemo.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/1/0433/7047/9768/files/vunimakiximugum.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/3704/6437/files/35599422356.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/15843942414.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/5490/4997/files/52106446164.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7957/3408/files/ata_chapter_25.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4531/3941/files/zarulewokasuvonena.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/92283418618.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0693/4688/files/42661601566.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gizuvesadumewagetikuxumut.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7880/2846/files/gopotezivebolan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5157/3657/files/sarafurivikitoxaburujulev.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8808/5145/files/bond_portfolio_investment_and_risk_management.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7110/3395/files/ardhanareeswara_stotram_telugu_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3666/3208/files/18463319864.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6993 14080 bytes
SHA-256: e56211afcf39e77ab61300eee8051c9a32fd541fe7b95faaadcd4e8d7018e61b
font_01_sfnt_off00009709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9709 5100 bytes
SHA-256: ad7a8f31f455d786cf0e7dcb31e64d92f995b60a70bde25314d1e2c6627f3c84
font_02_sfnt_off0000a855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA855 10088 bytes
SHA-256: a1320ecd2ccebf3578ee198b38d6f31f2c5682b508c3cdf135bcd63760f4ac0d