Malicious PDF — malware analysis report

Static analysis result for SHA-256 13b04cdf58caf97d…

MALICIOUS

PDF

47.3 KB Created: 2020-08-25 16:06:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: ff60679b46cc0424e959b386ef754320 SHA-1: 3bdaf7d7f0e0f53b6a9c97f26fbed444ecfb9ef9 SHA-256: 13b04cdf58caf97d50fa6d168463681c7ecaabd680c9a019cdd6570c10816ddd
194 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' heuristics. The document body text, though heavily obfuscated, contains a string that appears to be a lure for an admission form, further supported by the embedded URL. 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.ru/pify?keyword=bethune+college+admission+form+2018-+19 In PDF document text
    • http://files.douglascornishwebsite.com/uploads/1/3/1/3/131384777/rumimomux-xegitizebif.pdfIn PDF document text
    • http://jutoweguj.laurabreaux.com/uploads/1/3/1/4/131437044/7882006.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/1/0432/8197/3403/files/727666692.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9540/0356/files/10433066596.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2266/4348/files/gitugodu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3420/6631/files/23812154324.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4557/7116/files/64894502594.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dobemajafapurotexujebo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0446/9247/1962/files/wall_chart_of_human_anatomy.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/2047/3752/files/duzajemakigidos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9465/4632/files/25749629261.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/3969/2699/files/88350593168.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

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_off000061fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61FA 6192 bytes
SHA-256: da1c24d781e0c25727ea367fd39ec79629909e32aba0c7b00c61374028fc0e0e
font_01_sfnt_off000076e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76E0 10320 bytes
SHA-256: b23be4528fe6d01f9e3474e11a1d8b7b7a6e852f9d8af4ac0afb59147fcf4a01
font_02_sfnt_off00009a57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A57 16164 bytes
SHA-256: 4bd16c8abd39118228c1571b0005d4eb3b3e943e572fd92a2a80cfcb7b749349

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