Malicious PDF — malware analysis report

Static analysis result for SHA-256 8621dfad0b832451…

MALICIOUS

PDF

43.4 KB Created: 2020-08-03 20:28:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 07828ccdb2655568465abb455ec29449 SHA-1: 5955c2accd1658524d5e15fe19434686717543ae SHA-256: 8621dfad0b832451cde3c819f95cc1d1ace9c76b50b586bd97da713fd61c7a5f
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to a redirector service, indicating a link farm or phishing attempt. The primary redirector URL is `https://ttraff.cc/pify?keyword=berlin+sleep+apnea+questionnaire+pdf`, which is designed to lure users with a seemingly legitimate document title. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is part of a phishing campaign.

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=berlin+sleep+apnea+questionnaire+pdf In PDF document text
    • http://files.davisranchi.com/uploads/1/3/0/8/130874526/62403.pdfIn PDF document text
    • http://files.bec1.org/uploads/1/3/2/6/132681409/171f10a41ddd.pdfIn PDF document text
    • http://vomagozog.odditieseclub.com/uploads/1/3/0/7/130775162/zokigepe.pdfIn PDF document text
    • http://files.bethannysbabies.com/uploads/1/3/0/8/130813904/javabifesesizese.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/1/0428/6778/5884/files/87085346302.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2252/3288/files/tepeso.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8323/5489/files/42824267767.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3220/5722/files/63141199245.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5789/5841/files/88398257806.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4281/5643/files/75324837963.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/2283550224.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xovigaza.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/7391/1449/files/vebagurixobixopob.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3755/5864/files/75887730575.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9893/8274/files/6485997954.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 7

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_off00006ae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AE2 5212 bytes
SHA-256: e3179d3ea0ed90ed6db7589c6a5ac563849d42e8ae01bba625c700c812c090a5
font_01_sfnt_off00007ca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CA7 10764 bytes
SHA-256: 4c8f8b2373290ec57775a438c3773357ad60ced6275fad22fb8d94fa9591b47b

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