Malicious PDF — malware analysis report

Static analysis result for SHA-256 28bc5eaccf07590d…

MALICIOUS

PDF

47.3 KB Created: 2020-08-05 08:00:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 85a8f906fe77087ae39cc473c4311057 SHA-1: 28d3b4474b73e82f0e4ff6f8373ab605220a0d97 SHA-256: 28bc5eaccf07590d0df701205d6cc2ddf87686b1e7e222632cfc0223ebd6dc33
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains numerous embedded links, a common tactic for SEO poisoning or redirecting users to malicious sites. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=preven%25C3%25A7%25C3%25A3o+de+riscos+ambientais+pdf'. The document body, though heavily garbled, contains text related to 'Prevenção de riscos ambientais pdf', suggesting a lure to disguise the malicious intent. The presence of multiple unknown and potentially malicious URLs further supports this assessment.

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=preven%25C3%25A7%25C3%25A3o+de+riscos+ambientais+pdf In PDF document text
    • http://zujopuvu.yogatuned.nl/uploads/1/3/0/8/130873927/be1b46d0e0340.pdfIn PDF document text
    • http://files.artists4venues.com/uploads/1/3/0/8/130815014/wejuki.pdfIn PDF document text
    • http://files.cyclecharity.com/uploads/1/3/0/7/130739488/fekal.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/1/0430/2068/1377/files/mastering_elliott_wave_principle_constance_brown_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5391/6053/files/wowawufugoxofuxezovonin.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6607/8870/files/muwizedirukovut.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/1207/7206/files/zizulinagudarewibibog.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7379/7285/files/natikegorose.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6572/9429/files/90678898647.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7839/3749/files/24296997033.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7192/1571/files/advanced_ecg_boards_and_beyond_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dotalufakelani.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0446/5518/1987/files/best_english_speaking_course_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37263727017.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7063/5680/files/29787150557.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_off0000753f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x753F 5972 bytes
SHA-256: 378fa54cbc0d5f4e59fedb2bfe1127f525f54948e89d19f868830b637c34e81a
font_01_sfnt_off000088ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88AC 12512 bytes
SHA-256: 84118d4de2d65d3676b0d90d167b14fa457047e140dae6a96a86108229bf1a66

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