Malicious PDF — malware analysis report

Static analysis result for SHA-256 08373c3dc92c2aa5…

MALICIOUS

PDF

43.7 KB Created: 2020-08-23 09:24:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: c45e2d09eb2a11a428b384dd07b564b4 SHA-1: babbe3f431157013d26ff8954396654d302ecfc9 SHA-256: 08373c3dc92c2aa54f3a4d464da013e1c77b10e6fa41478f9463ffc8b60286f0
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. The document body, though heavily obfuscated, contains a URL that appears to be a lure for 'chapter 20 acids and bases worksheet answers'. This URL, https://ttraff.ru/pify?keyword=chapter+20+acids+and+bases+worksheet+answers, is flagged as a malicious redirector. 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=chapter+20+acids+and+bases+worksheet+answers In PDF document text
    • http://files.coolcaribbeanvacations.com/uploads/1/3/1/3/131398507/8146566.pdfIn PDF document text
    • http://files.iananthonycoleman.com/uploads/1/3/0/7/130776718/9342694.pdfIn PDF document text
    • http://kowaban.nationincorporated.com/uploads/1/3/1/4/131453050/vuwomu-zuwumapupulozak.pdfIn PDF document text
    • http://files.mrnicecream.us/uploads/1/3/0/9/130969633/9aec13d.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/1/0436/0703/1966/files/blender_3d_incredible_machines.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2735/8115/files/autumn_leaves_easy_piano_sheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5794/6519/files/79940921068.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/3603/0614/files/bapufegunajexanavunogafup.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0922/0501/files/83477396289.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/2216/1832/files/agrarian_reform_law_in_the_philippines.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/8945/9368/files/79556588302.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9242/6405/files/jedokiwer.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5546/4104/files/52033770416.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5627/4339/files/16022407585.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0416/5285/files/calistenia_ejercicios_en_casa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5698/8317/files/vesipufosogosajazuka.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 8

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_off00006b42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B42 5604 bytes
SHA-256: 8b1ef4d95bb422259bbbdeba27fdd4dd97493d2afc8fb73973f6445238203dd7
font_01_sfnt_off00007e55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E55 10304 bytes
SHA-256: 335dcf9ef0413fe3b5e97c33e97726539f54b8d36ef77cb3ac549e01d9747f8c

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