Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b4638cf2b37ef7e…

MALICIOUS

PDF

42.5 KB Created: 2020-08-02 19:21:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 79e99551f51d57ac53f2fdbb002a1826 SHA-1: 7b5ac22f6a2e448e29cb1485abc40e35302d7e71 SHA-256: 6b4638cf2b37ef7e19747c80b7af98f3c32b90f601197bab24c81bfd4c813ffc
194 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service that is known to host malicious content. The document body, though heavily obfuscated, contains references to a 'javascript timer countdown' and includes the primary malicious URL, suggesting a lure for phishing or further malware delivery. 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.cc/pify?keyword=javascript+timer+countdown+with+seconds In PDF document text
    • http://files.matildameadescubittdesign.net/uploads/1/3/0/8/130874489/1bb5bf11.pdfIn PDF document text
    • http://files.kireilifetherapy.com/uploads/1/3/0/7/130775652/7120309.pdfIn PDF document text
    • http://files.wordfestbucharest.com/uploads/1/3/1/3/131398440/zorilos-vexisi-polifud-xemufetu.pdfIn PDF document text
    • http://files.fpasports.com/uploads/1/3/0/7/130740323/175803.pdfIn PDF document text
    • http://files.pabigfootcampingadventure.com/uploads/1/3/0/7/130776891/xelupegepumenix.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/1/0431/6338/6016/files/wanisikesexogep.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4810/6134/files/wonovosafojuviz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/1886/0190/files/natexemubojixejegafefobi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1238/2117/files/nokafidomo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4338/9597/files/31636488235.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5539/0630/files/moxafilez.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8706/0378/files/xudiwo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/43561311815.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8565/2375/files/ravere.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/5121/9104/files/geloxisepudafujoji.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/3644/8667/files/1859502011.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3445/0840/files/21129894656.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6772/8279/files/kafemekipo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2973/3282/files/1605705358.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_off00006664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6664 5424 bytes
SHA-256: 11672062763e84e402d79e8fd926a9f7383971b0f8846c584fc2ecb64dfd7b85
font_01_sfnt_off000078c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78C0 10628 bytes
SHA-256: 7aa2f6cccdc0ef4c362b617412a33ef0954577ffc922ba29c9cc79d23a559af0

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