Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bf173938fd2e0bd…

MALICIOUS

PDF

53.0 KB Created: 2020-08-22 11:17:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: de02293a57ffd60ecaefb0725778d529 SHA-1: 19791fa53c91a9638d98bca725f5226324b580b8 SHA-256: 5bf173938fd2e0bdb430df3f5099a34c6c59858ea76bd20c5fff9eedf718a644
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple heuristics indicating malicious redirector links and a link farm, suggesting an attempt to drive traffic to malicious infrastructure. The embedded URL and document body text point to a lure related to 'mean median mode exercises with answers', which redirects to the malicious URL https://ttraff.cc/pify?keyword=mean+median+mode+exercises+with+answers. No scripts were extracted, but the PDF structure and embedded links strongly suggest a phishing or malware distribution 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.cc/pify?keyword=mean+median+mode+exercises+with+answers In PDF document text
    • http://files.lucygransbury.com.au/uploads/1/3/2/6/132680827/rasivefixavewuni.pdfIn PDF document text
    • http://files.ahhousecleaning.com/uploads/1/3/1/4/131409200/wivobagukarawafisosa.pdfIn PDF document text
    • http://files.innovativemhsolutions.com/uploads/1/3/0/7/130739919/ritubu_libunig.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/1/0433/6628/5480/files/91749032807.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6453/2900/files/28922606491.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7923/6774/files/jenut.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5080/2081/files/step_by_step_bulgarian_language_and_culture_for_foreigners.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5192/5155/files/ludowevisisupijotizul.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5265/2951/files/oxford_dictionary_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1987/9068/files/11593953196.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4183/9511/files/brightsign_xt244.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9954/4984/files/20758480546.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4167/6694/files/vibujamaxogimigupini.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7417/4622/files/wuxewula.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_off0000888b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x888B 5312 bytes
SHA-256: 53e633e5c3b70772e06b4685417abe9ca567ed1f4c570289c050bd077d5cb5cd
font_01_sfnt_off00009a81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A81 14248 bytes
SHA-256: a857ec281b6217a567ab6df4217a73b25d5dd88f6fbe2284b6621864f2174637

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