Malicious PDF — malware analysis report

Static analysis result for SHA-256 18f60e4c81d18b57…

MALICIOUS

PDF

58.0 KB Created: 2020-08-10 07:45:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 67e85b0319a4f1dda80c457bf91d8667 SHA-1: 2b29effd45c0360bc322d3ab19f02ed19517fefe SHA-256: 18f60e4c81d18b57b67c8f02ec0b279f7bc4ceee55c85a790011ae9272c556ff
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links and text that mimic a helpful guide on reducing PDF file size, a common lure for phishing or malware distribution. The primary link directs to a known malicious redirector infrastructure, indicating a high likelihood of malicious intent. The ML classifier also strongly flagged this PDF as malicious.

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=hoe+een+pdf+bestand+kleiner+maken In PDF document text
    • http://files.cliftonclimateaction.org/uploads/1/3/0/7/130775196/velajugawi.pdfIn PDF document text
    • http://zupipedat.dianehulseartist.com/uploads/1/3/0/7/130775129/0c504b0fc4b2f91.pdfIn PDF document text
    • http://files.aquafloradesign.com/uploads/1/3/0/7/130776150/tufekutan-remif-kasusabuk-manil.pdfIn PDF document text
    • http://pasig.nekrologik.com/uploads/1/3/2/8/132816066/017124.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/1/0428/9455/7350/files/53173314116.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5711/8374/files/wakujubiveg.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0960/5791/files/75707993446.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3119/7856/files/53528650185.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8488/1825/files/zokaxopifekotobodanugoxef.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3419/8684/files/bujeditomaxoliterulewadez.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1468/3815/files/webetogaxepulafu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2763/5095/files/over_and_over_again_lyrics_nelly.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2331/7662/files/jugawut.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5561/9994/files/the_axial_skeleton_review_sheet.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 5

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_off0000a4ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA4BA 5352 bytes
SHA-256: 9aedfe1ffe8d84155e8903688edfd4d452cb9dcc613840e13c5ca770c60dd1a9
font_01_sfnt_off0000b6d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6D2 10764 bytes
SHA-256: 358e254cc2cdf5eff05121378c5a1d6ae65c92769bcc39455436d8eb3610dc93

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