Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc81a021ed139e7b…

MALICIOUS

PDF

40.8 KB Created: 2020-08-20 22:06:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 6e53ee1ccde0f212be369b35c69cd454 SHA-1: e5a784c3de16f2701fe27b64c4381d1361532ac6 SHA-256: cc81a021ed139e7bf1d8560021f2a5f4417f6fb45f8ea329144e5027054c8253
194 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, a technique often used for SEO poisoning or to redirect users to malicious sites. One critical heuristic firing indicates a direct link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL that triggers this heuristic, suggesting a deliberate attempt to lead the user to a harmful destination.

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=antigone+pdf+dover+thrift+edition In PDF document text
    • http://files.eagleyoungmarines.org/uploads/1/3/2/7/132710661/vupotosaxidig.pdfIn PDF document text
    • http://files.studiofred.net/uploads/1/3/2/6/132695832/podixabus_tejibunedomap_tesivev_luzibufir.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/1/0432/2469/4942/files/tevuganefavefipogefil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3373/8911/files/kezewip.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6286/1730/files/jitetenifokexi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8954/9726/files/vubedesuz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4551/7469/files/50605550645.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3214/0186/files/boxudorapumulivemebol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2950/2874/files/josijinogedogajasakajese.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0505/0021/files/85230333119.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7479/8247/files/bomb_calorimeter_working_principle.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7912/2587/files/53602262525.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3920/3221/files/mepijoxomexikik.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3458/1919/files/jilediko.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 4

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_off0000639a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x639A 4932 bytes
SHA-256: 054375daca6c66ac3133a8785b3cf57c2bfa96dcdb6be51cd326d0f5aed205b5
font_01_sfnt_off00007467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7467 10032 bytes
SHA-256: 0ef2a51e0f59c538acc6b54d96b4db793d0cd657c1049274429c0c900aac61aa

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