Malicious PDF — malware analysis report

Static analysis result for SHA-256 81601468f31726ed…

MALICIOUS

PDF

48.2 KB Created: 2020-08-15 22:22:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 1801a46d4c83a878b1648a757581e11c SHA-1: e08db2ab795fab459820028efe4dbfb48489bbd7 SHA-256: 81601468f31726ed0283dffedf1f689f7a4881c0e46a7591ea9fef246c646c39
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple heuristics indicating malicious redirector links and a link farm, all pointing towards a phishing lure. The document body, though heavily obfuscated, contains a URL that appears to be a resume format download, which is a common social engineering tactic. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wb?keyword=resume%20format%20for%20freshers%20download%20pdf In PDF document text
    • http://wijofo.acbusinessschool.com/uploads/1/3/0/7/130776779/3399677.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/1/0437/9289/2053/files/kejopisejesipok.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6829/3287/files/puvos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3957/9546/files/cancer_de_garganta_por_vph.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6756/3418/files/direct_method_and_grammar_translation_method.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/0770/3201/files/74892584582.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3444/2919/files/convert_decimals_to_fractions_to_percents_worksheets.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9562/1786/files/jewepa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8738/7037/files/19761690620.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/movikulewerudazuxedo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3346/8821/files/39322659673.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8026/9462/files/rudonawenoxunesakuluzex.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000782d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x782D 5380 bytes
SHA-256: 1a7e59d082672976fd8a7c4740c6753b9f2120b63791b6601a44d394845ce604
font_01_sfnt_off00008a66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A66 13312 bytes
SHA-256: becfa66b983ffc25bb2a3b5ae73f80b3678265db47de8c98af19f95d57d590a3

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