Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4df89248fac323e…

MALICIOUS

PDF

69.9 KB Created: 2020-08-25 18:02:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 0de8fac30441c67da917bf2bdb630abb SHA-1: be3db6ae423c2a709b680f16cbdb66f1817270d2 SHA-256: a4df89248fac323e3994e113e71302b99514ce615a52ed890acf01e17fab02ee
194 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with one specifically identified as a malicious redirector. The ML classifier also flagged the document as malicious. The presence of a link farm suggests an attempt to manipulate search engine results or distribute malicious content through a large number of seemingly benign URLs. The document body itself appears to be corrupted or obfuscated, but the presence of the malicious URL is a strong indicator of 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.ru/pify?keyword=goldschmidt+2019+abstract+template In PDF document text
    • http://sopogiwe.tatjanakusic.net/uploads/1/3/0/7/130739591/vikaxital.pdfIn PDF document text
    • http://files.thedeclutterbugco.com/uploads/1/3/0/7/130739525/49595ea.pdfIn PDF document text
    • http://zaruzajuk.agc-educational.com/uploads/1/3/1/3/131383483/6740662.pdfIn PDF document text
    • http://files.yogaresearchsociety.com/uploads/1/3/0/7/130740255/fegokulin.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/1/0431/1724/8672/files/lexejifajimejimafofi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4070/9527/files/xuruwufadisivavolux.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1791/0946/files/fixivuvavagipefugi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2124/6370/files/18674615289.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2241/7046/files/ukulele_tabs_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/0433/6027/files/79267649773.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8060/5077/files/fisiopatologia_asma_pediatria.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6772/8279/files/autosar_bsw_makefile_interface.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2284/4067/files/google_camera_android_version_9.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4375/7985/files/cambridge_news_guided_bus_accident.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 3

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_off0000c876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC876 5968 bytes
SHA-256: 244dcc379c3505d3eb32fe2ba26547a78dc20551410292be9e0f3b61f9dde880
font_01_sfnt_off0000dc97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC97 14904 bytes
SHA-256: 648be3b6c0c127cb7c5c69af4073787aba6f6fb5376cd9f51c22e6cb1e563cb6

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