Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9959fd102e0e00b…

MALICIOUS

PDF

39.4 KB Created: 2020-08-22 18:24:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: d6d7c220f64ebe2a1528f50cad6b61b5 SHA-1: 586b892cf113ea3dd82f32a6f0f86273d1d436c7 SHA-256: f9959fd102e0e00be179f5e15b233acc0e65f7fc3f99a5b44b0d2e3fbc6eda71
194 Risk Score

Malware Insights

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

The PDF was flagged by a critical heuristic for linking to known malicious redirector infrastructure. Additionally, it contains a large number of external PDF links, characteristic of a link farm. The ML classifier also strongly indicated maliciousness. The primary malicious IOC is the redirector URL, which likely serves as a gateway to further malicious content or phishing pages.

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=vertebrate+invertebrate+sorting+worksheet In PDF document text
    • http://files.lespals.org/uploads/1/3/0/7/130775897/pidisitug_mikaf.pdfIn PDF document text
    • http://files.islandgemcreations.com/uploads/1/3/1/3/131381539/e458903966e.pdfIn PDF document text
    • http://files.classicburgeronline.com/uploads/1/3/1/3/131384058/bujadab-ziwabigi.pdfIn PDF document text
    • http://files.powercountyfairandrodeo.com/uploads/1/3/0/8/130873810/dilulekano.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/1/0430/8919/9268/files/wovibosuzupenoritar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2904/4119/files/assam_rifles_final_merit_list_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4752/6305/files/48273745129.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5753/7439/files/eeg_procedure.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4401/1168/files/16335112868.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5740/4318/files/brche_addition_und_subtraktion_aufgaben.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gaxasukazojolivuf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1884/4322/files/add_blank_page_to_java.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/5128/4642/files/73085279959.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4413/3281/files/novemora.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6204/2529/files/lagovebijofo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0364/2007/files/personal_budget_planner.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 6

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_off00005b98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B98 5236 bytes
SHA-256: ee0b03c0981bc28fba16e172866c543fd15bd03240890689eb55268584c9ca10
font_01_sfnt_off00006d79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D79 10348 bytes
SHA-256: c15c8504b6f28e17720826e483a8ba5816e6d6c081d96b7d64ac0c1c2a3e7d72

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