Malicious PDF — malware analysis report

Static analysis result for SHA-256 16e6238833d9ffd3…

MALICIOUS

PDF

41.6 KB Created: 2020-08-13 08:49:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 8166df1b85a10613f34e3a62a7a4136e SHA-1: 9f1a4fda0c5a6f61684c08bf1297e6e9e39cf0e0 SHA-256: 16e6238833d9ffd3fa35a360c0670140592897a409769058f44bf2c9a1df2870
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to an SEO redirector, which ultimately points to a malicious URL. The document body and embedded links suggest a lure to download a PDF, likely a phishing or scam attempt. The ML classifier strongly supports the malicious nature of this PDF.

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/wb?keyword=rosanna%20toto%20guitar%20pdf In PDF document text
    • http://files.bossmomlife.club/uploads/1/3/1/4/131438448/vezefexoma_putuxagemu.pdfIn PDF document text
    • http://files.philologia178.org/uploads/1/3/2/3/132302759/disunobegotanelubo.pdfIn PDF document text
    • http://files.manupagainstbullying.org/uploads/1/3/0/8/130813988/sezumikofelofuzazaw.pdfIn PDF document text
    • http://files.msmerg.com/uploads/1/3/2/7/132740239/bukose_suwovir.pdfIn PDF document text
    • http://files.joyfulartstudio.org/uploads/1/3/2/3/132303068/liluvikidixugo_fuzoweka_zelevilevivi_lovarobad.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/1/0434/4014/4534/files/96408374995.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1892/7775/files/56251548169.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1231/6584/files/lightning_crashes_chords.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9485/2252/files/bojapogodomelafanazuze.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8231/7978/files/16816468102.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1806/7866/files/87924807913.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6043/5871/files/towukesilamuvonebulutajan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1279/2221/files/holt_world_history_ancient_civilizations_textbook.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6921/0773/files/51330675035.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1792/7837/files/67516546450.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1485/6610/files/becoming_a_better_husband.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 7

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_off00005a18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A18 5184 bytes
SHA-256: eb4a38127b031b43faa3f4b47b7faee7b1fe867246a948d978fbb5c723b5628d
font_01_sfnt_off00006bcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BCC 14708 bytes
SHA-256: fe7bb4dbb7c037c70052a40a9c016800d4ed9e93757986746fb5eece20ccd841

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