Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dfb149955d13c3e…

MALICIOUS

PDF

61.3 KB Created: 2020-07-29 22:43:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: a4dd67631f52d05abbdabbf04c433210 SHA-1: 829cf9e113b53b55100dfaea1eac025ec4c99c40 SHA-256: 4dfb149955d13c3ec2766456cd10ae17724ec3d976017cf6dca6e3f2a7ed2baa
194 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, identified as a 'PDF SEO Link Farm'. One of these links, 'https://ttraff.cc/pify?keyword=emotions+and+feelings+vocabulary+pdf', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'Emotions and feelings vocabulary pdf', suggesting a lure to disguise the malicious intent. The ML classifier also strongly indicated maliciousness.

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=emotions+and+feelings+vocabulary+pdf In PDF document text
    • http://files.janabrodkin.com/uploads/1/3/1/4/131453595/c2e8aa3b6c.pdfIn PDF document text
    • http://files.davcal.org/uploads/1/3/2/8/132816042/02eb4.pdfIn PDF document text
    • http://files.reedhendersontrust.org/uploads/1/3/0/9/130969551/masilegevesogere.pdfIn PDF document text
    • http://files.wildwillowwellness.com/uploads/1/3/2/7/132712451/tanuj_zixejuka_venozera_dujozewamide.pdfIn PDF document text
    • http://files.capitalcitycivitan.net/uploads/1/3/1/3/131398542/muputidamaxape-bigekadilukirad.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/1/0430/4211/1641/files/2347251997.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2135/2606/files/43539508338.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1374/1472/files/5070953956.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vemuvuferakodumi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6265/6157/files/37621634514.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7919/7081/files/76488947928.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3926/8770/files/57018034614.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6461/4303/files/49017956471.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8089/8973/files/63236929380.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8451/3444/files/butitaranuvabibudusegip.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/14192803693.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3937/5012/files/rawipasovozemebadolerego.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_off0000b1d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D9 5616 bytes
SHA-256: 5df2292d7949fd7552ccbc04f8d3bf861bafb04425db385b3de82b821205ba08
font_01_sfnt_off0000c4e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4E3 10244 bytes
SHA-256: fb13796dd5262d1fbb1d8bd267af8da63d103dcd866746b29daf37fc4de65723

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