Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbec2907c250ea5a…

MALICIOUS

PDF

42.6 KB Created: 2020-08-12 02:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 5a16afd64173a670b983a74ffd2630fd SHA-1: 5016d83537c3036f6d10882cd526f137c8b45e1f SHA-256: dbec2907c250ea5ad4fbcf7b7f8092838bad65b2ec7928e828d36271f263593e
194 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a critical heuristic firing for a malicious redirector link. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=como+aprender+coreano+pdf', which is flagged as malicious. This indicates the document's primary purpose is to redirect users to malicious sites, likely for further exploitation or phishing.

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=como+aprender+coreano+pdf In PDF document text
    • http://files.pro-mx.com/uploads/1/3/1/4/131482962/lepezo_vositotuvil.pdfIn PDF document text
    • http://files.boldexpressionsco.com/uploads/1/3/2/7/132741535/6950420.pdfIn PDF document text
    • http://files.oakleyboycott.com/uploads/1/3/0/7/130776861/c7884ab2cd93e4.pdfIn PDF document text
    • http://files.jeecontentandcopy.com/uploads/1/3/1/6/131606819/2afeddf268.pdfIn PDF document text
    • http://lekanipe.wgct.org/uploads/1/3/2/7/132710507/tebisadegir_durelep_bajixoji_limuzojimoxilif.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/1/0433/7028/3166/files/daigremontiana_kalanchoe_aranto.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7792/7072/files/nodagesexadinojovizasapo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7300/2906/files/72923961722.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7492/0347/files/sepix.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9464/5663/files/ediacaran_extinction_and_cambrian_explosion.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0546/7035/files/63138175462.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2992/0930/files/80405207643.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8032/7076/files/luvubanizonom.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0084/7780/files/wits_bsc_computer_science.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1283/1907/files/80637605263.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7188/9815/files/61488176738.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5101/6601/files/23295884527.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8309/5459/files/69342060164.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 8

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_off00006697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6697 4996 bytes
SHA-256: 1588c1810ab07528aab44dd7c322a7c9a4b159e7558f5f4334712abb19a49df9
font_01_sfnt_off0000777a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x777A 11352 bytes
SHA-256: 1a5c0e007a3e6dd7dc101c256f04915f9becf91847711c4d6840c855e3598931

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