Malicious PDF — malware analysis report

Static analysis result for SHA-256 8831c8d4f12a2412…

MALICIOUS

PDF

42.0 KB Created: 2020-08-18 15:04:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 2e870f15684714d88ae1a558e607e035 SHA-1: da2d7d63d975a529fdca3c9a51600feec5a38290 SHA-256: 8831c8d4f12a2412653bcdc7e15bcf7498d03ae79ebb847d11a315e9de11b303
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, many of which point to a redirector service known for malicious activity. The document body, though heavily obfuscated, contains text related to 'home rental agreement format' and a URL that aligns with the redirector heuristic. The presence of a large number of external PDF links suggests an attempt to manipulate search engine results or distribute further malicious content.

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=home+rental+agreement+format In PDF document text
    • http://files.happywillowsoap.com/uploads/1/3/1/4/131437037/91c6c9b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7048/7712/files/similar_triangles_proofs_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7029/9048/files/wofetitawanigit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2853/6731/files/lazekakubezimarofofew.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6325/4944/files/xonixizasuwak.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dejozetopugewafapo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7141/5196/files/48287000255.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5035/3318/files/45283890018.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1703/6198/files/2126535028.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9679/3503/files/83810961755.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4448/7836/files/vukokakafirobitunivazumiz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7624/7967/files/53006876714.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 1

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_off00005b1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B1C 4608 bytes
SHA-256: 6d157fa2f9a6b7364a35b6f7e7ca87882b7e0c83ddb8f83caa469a66ed823fd6
font_01_sfnt_off00006a9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A9C 10012 bytes
SHA-256: d442da81cb7ccb3ac24f47560b4a0f9c459b3cfc847491abddeff8ddd3772e8f
font_02_sfnt_off00008cdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CDB 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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