Malicious PDF — malware analysis report

Static analysis result for SHA-256 404e119a972bbc28…

MALICIOUS

PDF

42.4 KB Created: 2020-08-14 20:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: 9f29e1dde4d5f2b54bfd57c24d32124e SHA-1: 65fe69d21c80b16232703f6392223c940d5df7e3 SHA-256: 404e119a972bbc285e66032532491f32a0ffe64d7bcd375720c66eba0193fcef
202 Risk Score

Malware Insights

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

The PDF contains a lure related to an 'entrance exam answer key' and includes a prominent call-to-action phrase. A critical heuristic indicates that embedded links point to known malicious redirector infrastructure, specifically the URL https://ttraff.ru/pify?keyword=amu+11th+entrance+exam+answer+key+2018. The document also exhibits characteristics of a link farm, with numerous links to external PDFs, including one hosted on cdn.shopify.com. The presence of a malicious redirector and the link farm structure suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=amu+11th+entrance+exam+answer+key+2018 In PDF document text
    • http://gigadu.jamesferris.ca/uploads/1/3/2/7/132741334/xupepiza.pdfIn PDF document text
    • http://lenusel.circmfarms.com/uploads/1/3/1/0/131070841/pinobopi.pdfIn PDF document text
    • http://files.mentalhiccups.com/uploads/1/3/2/6/132695288/244289.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/1/0433/9246/7109/files/zotabiwegatafexalufow.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6535/2097/files/67525113521.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2078/7613/files/vejitetetozipevebigogase.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2846/2233/files/what_is_a_thematic_statement.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7180/6366/files/90667206025.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7111/1330/files/21576055814.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5584/8355/files/california_general_contractor_license_study_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7695/1965/files/tibuxevujuwotirilopiniju.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7560/9510/files/poxopajapalog.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7313/2957/files/list_of_oil_and_gas_companies_in_kuwait.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 4

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_off000065ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65EA 5844 bytes
SHA-256: f120ff6060e490f43e34dfde089d0dbf5d4335872ff857d0a1cb9819931e0f9d
font_01_sfnt_off000079bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79BC 10312 bytes
SHA-256: 6ccd7c22741c4f236196387a390901f1a0d9f500d255ee7049b6e31e8ad8cb66

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