Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b78561f63fe7010…

MALICIOUS

PDF

33.9 KB Created: 2020-08-06 21:30:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 181937fbdf1ae681039c57d0152a2721 SHA-1: f92bbeee918f99a19266231887bee64a9cf38b61 SHA-256: 4b78561f63fe70100f07b255cd55088fc0db4966510824d6f0011a81be2ce026
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a mass external link farm, with the primary link directing to a known malicious redirector. The document body text and embedded links suggest a lure to download a PDF converter, which is likely a pretext for delivering malware. 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.cc/pify?keyword=download+converter+pdf+to+word+nitro In PDF document text
    • http://files.faithbaptiststacy.org/uploads/1/3/1/3/131383924/losepefim-xotuku-mebox.pdfIn PDF document text
    • http://files.painting4change.com/uploads/1/3/1/0/131070379/c133bd49.pdfIn PDF document text
    • http://files.jaidetimmgarcia.com/uploads/1/3/0/7/130775768/9d451.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/1/0434/5951/0425/files/skyward_sword_gratitude_crystals.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5644/8167/files/76853353847.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3732/5472/files/evermotion_archinteriors_vol_44.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8451/3440/files/79285043015.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8436/5476/files/bediwotujeg.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3441/8075/files/jotiwenokot.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1651/0873/files/22931431199.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/puwojadudabub.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1850/0765/files/kesivojofaneduz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7757/4557/files/41591582807.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6314/8706/files/pifitesuwe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1873/2191/files/24147728123.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4190/7100/files/bupexaragezobelazejobupe.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_off000046b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x46B1 5120 bytes
SHA-256: 162840dfc72c5ffd763a900958a4c0253249992a80df68a5ed3e125e31ba34a6
font_01_sfnt_off00005850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5850 9524 bytes
SHA-256: 33a3bfc18dca38f0aef344b8d55f82c6046fe52e610bb36981533dcf063909f1

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