Malicious PDF — malware analysis report

Static analysis result for SHA-256 a16262be228a367a…

MALICIOUS

PDF

51.5 KB Created: 2020-09-10 05:00:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 01347a36edc0d91659a02509b6975780 SHA-1: 64ca75131ba36f3f665938a1844e85cfa6a8784f SHA-256: a16262be228a367ab8b9d28b19bcee2ec8a55b02624a13abd7c9c70dff305f77
194 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many of which point to a link farm designed to distribute further malicious content. One critical heuristic identified a link to a known malicious redirector infrastructure at 'https://ttraff.com/wb?keyword=foundations%20in%20personal%20finance%20chapter%209%20test%20answer%20key%20pdf'. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the link farm and redirector strongly suggest a phishing or malware delivery attempt.

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.com/wb?keyword=foundations%20in%20personal%20finance%20chapter%209%20test%20answer%20key%20pdf In PDF document text
    • http://fefevuro.bo-co-wandering.com/uploads/1/3/1/0/131070872/gotupalabogi.pdfIn PDF document text
    • http://files.egyptiangift179.com/uploads/1/3/0/8/130874110/kirevu_potakapa_wokozogo.pdfIn PDF document text
    • http://xabemidet.uniquestationers.com/uploads/1/3/0/7/130739430/taguteg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_854749b94cf34baca9ab932ae6fd90a9.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/d017d5_9d3084158d3048b68e0198243c30abbb.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/0ad6c7_6afa69eadb6647658dd2907d59d86389.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/7f16bd_70c25fe4d61446cbbec99c7398e659d9.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/f523c3_ba39737bdbcc43bea797bbe0260a4076.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/a44510_cce283931d2a4649a9478e4810b4a0f8.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_13c88426f0d94e63b2eba14d524863fe.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/bd5c68_a233a78039f941a38ad6317ada2c96f6.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/e1a791_4c6c6f3459074e758f63492cc62761b1.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 5

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_off00008774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8774 5612 bytes
SHA-256: 0699de4673d9a19c4cb59d22de63752ef808c12ead0c8a17f0697c175dc07473
font_01_sfnt_off00009a9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A9C 11020 bytes
SHA-256: f7eb07ca777faaf6b54ed0941a8cb4751b5716573d636036108a6e450fdd6b70

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