Malicious PDF — malware analysis report

Static analysis result for SHA-256 91cd6e5fd0aefc34…

MALICIOUS

PDF

48.7 KB Created: 2020-08-18 14:56:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: d0400afdbd83f96f74ad99cd20ad8373 SHA-1: cadd1bf0f4dc11221d15d9ac95f767fd334ceff4 SHA-256: 91cd6e5fd0aefc345fc01f1704071ace678bc8278ffdfe595b9b6990fbc5b8b0
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious redirector links and a link farm designed for SEO manipulation. The document body, though heavily obfuscated, contains a URL that points to a redirector, which is likely intended to lead the user to a phishing or malware distribution site. The ML classifier also strongly indicated maliciousness.

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.com/pify?keyword=2016+biweekly+payroll+calendar+template In PDF document text
    • http://sikajasif.workingwordsproductions.com/uploads/1/3/2/7/132710714/6834442.pdfIn PDF document text
    • http://nejan.barbara-sonner.com/uploads/1/3/1/4/131437594/bisedo_somuvugexepug.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/1/0431/2642/3701/files/frozen_shoulder_physiotherapy_management.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3191/0821/files/89295749819.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7369/0017/files/81925683254.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6049/4490/files/34458487311.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0450/3601/1678/files/apple_developer_program_profile.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1628/1512/files/zte_z223_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3405/7621/files/drop_down_list_excel_using_different_sheets.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8221/1733/files/fishing_report_oregon_coast.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pegofegomena.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8568/4124/files/brief_summary_of_the_bible_from_genesis_to_revelation.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5788/8932/files/25108762058.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2358/0835/files/badrinath_full_movie_telugu_hd.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 3

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_off00007db2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DB2 5824 bytes
SHA-256: 5e0c44f974cf6a21f77117e4349bbd7d6276efda14fc6166120f8dca00314a09
font_01_sfnt_off00009174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9174 10536 bytes
SHA-256: 0eed043efe44cb9e0e01dd8320a53d149ea8bbbd77cb54d28cbe9e5243d87035

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