Malicious PDF — malware analysis report

Static analysis result for SHA-256 818b16756dcd63ab…

MALICIOUS

PDF

50.0 KB Created: 2020-08-10 00:06:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: f4849883c730cc32ec11389461dfa1b6 SHA-1: 3f60d8dfbc2ce95348f4d71d9086257e6de96c55 SHA-256: 818b16756dcd63ab60ed83aec16161c1d4ec5a8cf1564bb9af95f0bda874e17f
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which point to a redirector service known for hosting malicious content. The document body, though partially corrupted, includes a URL that appears to be part of this redirection scheme, suggesting a phishing or scam attempt. 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=alimentaci%25C3%25B3n+sana+equilibrada+pdf In PDF document text
    • http://files.moonflowerproduction.com/uploads/1/3/0/9/130968996/vosumevivisurubufo.pdfIn PDF document text
    • http://files.veracitymediagroup.com/uploads/1/3/1/4/131452841/kuvesivox.pdfIn PDF document text
    • http://xisezosi.thebeautycat.com/uploads/1/3/1/1/131164243/xidolosipapekor.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/1/0432/1758/4283/files/zubururifobolotupi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37144816260.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6304/9378/files/minecraft_instant_structures_mod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4628/1122/files/46861481827.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1478/2109/files/apocalypse_meltdown.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3459/8809/files/tikuxixavob.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6467/1909/files/65692514973.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1351/2100/files/vosevulugupewijolekew.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8104/7957/files/1342849238.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6842/3334/files/jijamuwarolakep.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6031/3768/files/nixerenalukimi.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_off00008053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8053 5692 bytes
SHA-256: b3c94b15bbe45d61a41c5499838ab100ff3863042948488f10edf0808014919b
font_01_sfnt_off00009348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9348 11672 bytes
SHA-256: 8f9f09836cf9fffe57115a0a9902aa3e9c1dc5a3a133676e85512e01a5ecec57

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