Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bb3ddec21325ebc…

MALICIOUS

PDF

41.3 KB Created: 2020-08-06 11:48:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 686878bdf8bb63e44294678adb6cec16 SHA-1: aa84964679d033d9cbb4193e14cbbb84a5e2a50c SHA-256: 9bb3ddec21325ebc89ab6e3d2c3daefddfddeeac358f0ee2e526528c08dbee89
194 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body contains text related to 'Approximation questions pdf free download' and the malicious URL, suggesting a lure to trick users into downloading potentially harmful content. The presence of a link farm further supports the malicious intent.

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/pify?keyword=approximation+questions+pdf+free+download In PDF document text
    • http://files.deepgreenbushschool.org/uploads/1/3/1/4/131437181/c744f96f7.pdfIn PDF document text
    • http://files.rioricohistoricalsociety.org/uploads/1/3/1/3/131397981/vagabipi.pdfIn PDF document text
    • http://files.daytona100ultra.com/uploads/1/3/1/1/131164275/dezasadiralol-regigebara-voxuwafifit.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/1/0431/5611/1520/files/nesovikumavofufiv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6567/9776/files/complex_sql_queries_with_examples.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4616/6943/files/35452592690.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0522/1784/files/synapse_rc7_custom_ui.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/80023348890.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0450/3748/6238/files/bartending_books_for_beginners.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4760/8730/files/dasewalupobodesalevemi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/8729/6680/files/86941340385.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8016/3227/files/blank_continent_map.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/takuz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4464/1685/files/fikorexililedi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0185/6668/files/96405865802.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 2

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_off00005f69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F69 5460 bytes
SHA-256: 518a90d1e62fcca6bcf59000b2f15934d36d6299b877c28041a5937c53197518
font_01_sfnt_off000071f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71F6 11260 bytes
SHA-256: b23207a60add0b834dee256bcea58daa6dbe715843c076348a77441e821e098e

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