Malicious PDF — malware analysis report

Static analysis result for SHA-256 491da1c6da6fc12b…

MALICIOUS

PDF

44.3 KB Created: 2020-08-13 22:26:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: f03e24be72968bc73df9918f5087f28d SHA-1: acd81d80e613c8c69eac94bc6d584e539258bae1 SHA-256: 491da1c6da6fc12b28f89236ddfe4cfbd86b761094abac22d1eb8fab8f4f6fb5
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a mass external link farm, with a critical heuristic firing for a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=bootstrap+4+form+login', which is also listed as a malicious redirector. This suggests the PDF's primary purpose is to redirect users to malicious sites. No scripts were extracted from this sample.

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=bootstrap+4+form+login In PDF document text
    • http://turot.youngscientistsseachest.com/uploads/1/3/2/3/132303195/3227618.pdfIn PDF document text
    • http://jizidufu.elanaaccess.com/uploads/1/3/1/8/131871699/rosamodom.pdfIn PDF document text
    • http://files.summitlakewi.org/uploads/1/3/1/0/131071043/moputexokuwilosukaz.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/1/0435/5496/3617/files/free_christian_movies_for_mobile_phones.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5525/9560/files/47348989818.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0464/9884/files/kowanav.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0464/8859/files/higher_human_biology_questions_and_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xefafozerokadugatevaru.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4048/0164/files/pezuparewiri.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/6163/9318/files/jepureve.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0632/7957/files/tagapinujataguronevox.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3662/2498/files/nonupidojuzujagedoxenep.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5144/1560/files/35638201815.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9440/8354/files/arnis_history.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2190/0696/files/facade_yes_no_oracle.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63F2 5356 bytes
SHA-256: 13c2d4eb6408100de0b5c933f92ec04461e30ed143f1bec608ff84ea4e091812
font_01_sfnt_off00007622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7622 14936 bytes
SHA-256: 9313c20d19b00046aa4a051858b1bb97ddae702e8da55cb1c483e608ca57f295

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