Malicious PDF — malware analysis report

Static analysis result for SHA-256 a72ce8be816b960f…

MALICIOUS

PDF

35.1 KB Created: 2020-08-19 02:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 0819b5ba34a39204a384bb291e59866b SHA-1: e6ce9e69ee25d2e2c56535b1aaaf625ac7629d7d SHA-256: a72ce8be816b960fc33438a9838966256a687481db855eec474d40bafbf5cbaa
194 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded URLs, with a critical heuristic firing indicating a PDF link farm. One of the primary links directs to a known malicious redirector infrastructure. The document body, though heavily obfuscated, also contains the URL 'https://ttraff.ru/pify?keyword=shoo+fly+sheet+music+free', suggesting a lure or redirection mechanism. The ML classifier also strongly flagged this PDF as malicious.

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=shoo+fly+sheet+music+free In PDF document text
    • http://luzapuwu.taverhamdaycentre.org.uk/uploads/1/3/2/8/132814930/novuw.pdfIn PDF document text
    • http://files.avriltahoe.com/uploads/1/3/1/3/131380063/jobiwutaxalofeg.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/1/0435/4444/5092/files/vaxuto.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6006/7480/files/lolagutu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0281/4876/files/attitude_quotes_in_english.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9151/6828/files/2020_telugu_calendar_file.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/5254/5701/files/sheet_metal_gauge_conversion_chart.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1312/8867/files/19307953116.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0332/2269/files/26918550299.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/muzoguganava.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3978/4103/files/fomunikegujumexefaw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2526/7877/files/51424477766.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9359/9132/files/cognos_11_active_reports_tutorial.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9948/0473/files/62085272771.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_off00004a65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A65 5116 bytes
SHA-256: 53c713350852ae9257bac4f6749920698f10d19e3d6449009b311bc522a6cb94
font_01_sfnt_off00005bb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BB2 10608 bytes
SHA-256: f15751b0e41e0d2346c99b9f0a746573ed7c2a046a80f3f26b3446045ad70184

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