Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f804571f374faeb…

MALICIOUS

PDF

43.5 KB Created: 2020-08-12 22:51:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 82d4a748c9869c6a7fa3579e1c077ae4 SHA-1: e4f3360aeb076ddec51525f097baadbeab06568b SHA-256: 4f804571f374faeb01ddc6e136a983b579f6fb879364ba9037ad191c24721121
202 Risk Score

Malware Insights

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

The PDF contains a mass of external links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'add text to a pdf file online free' and includes the malicious URL, suggesting a lure to a phishing or malware distribution site. The presence of numerous PDF links further supports the SEO link farm heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=add+text+to+a+pdf+file+online+free In PDF document text
    • http://pebine.tpched.org/uploads/1/3/1/4/131453870/jaxidute.pdfIn PDF document text
    • http://zanemukog.g2barnhunt.com/uploads/1/3/1/0/131070487/goxerorirezubenudule.pdfIn PDF document text
    • http://files.nealsehgal.com/uploads/1/3/1/8/131871535/xupufusab-vuvazowujoli.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/1/0428/9835/8432/files/33374625424.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/9284441163.pdf?v=1594212706In PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6255/0940/files/35177887452.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8761/8463/files/new_apostolic_church_doctrine.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5045/1623/files/vefupulowegodopojomidoxib.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/5736/2597/files/andorra_la_vella_mapa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7431/3633/files/89329208033.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4738/6264/files/power_amplifier_basics.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0212/5733/files/inheritance_book_2.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3892/4181/files/2395981863.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_off00006c6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C6A 4912 bytes
SHA-256: 4edcb408439c82998b585ab608cfa2b3b350e6dc7fffc83722718e57b8ce70f4
font_01_sfnt_off00007d2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D2D 10420 bytes
SHA-256: d17037297b3db749cb647a8325e61187652e275dcdff4d373696db76bc909907

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