Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb728cabc3220319…

MALICIOUS

PDF

33.7 KB Created: 2020-08-01 15:24:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 8f64a9235394557ebd40a68edad212d6 SHA-1: c25293b0192134f3f774041459cd788617b041dd SHA-256: cb728cabc3220319782b75eb3ea94df3bfb950db4115d2e24bfd0823e26493cf
194 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded URLs, with one identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates a direct link to malicious infrastructure, and 'PDF_SEO_LINK_FARM' suggests a large number of external links, likely for SEO manipulation or to distribute malicious content. The primary malicious IOC is the redirector URL.

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=chrome+shelled+regios+episode+1 In PDF document text
    • http://files.denverbellydance.com/uploads/1/3/0/9/130969370/875a648b0db1.pdfIn PDF document text
    • http://files.6cecilplace.com/uploads/1/3/0/7/130739537/vosolijalegew.pdfIn PDF document text
    • http://files.patsysbarandgrill.com/uploads/1/3/0/8/130813526/sidesotake.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/1/0435/4431/4011/files/92311960937.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3759/6575/files/gta_5_dns_code_xbox_360.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5477/5970/files/nibobememunog.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/52733892229.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9435/1778/files/xupofuret.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1190/7488/files/65546749927.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5815/7982/files/97873135499.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/4647/8759/files/gegazasolafesuxubibofat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/8321/6549/files/meboginugakavijus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7731/2405/files/92665151127.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5669/3397/files/zavikolasosuz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3019/9966/files/tobamunoximanexufopabu.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_off0000456c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x456C 5120 bytes
SHA-256: 3480780d69ffebe98ec9cb7da703c0c4d52b8711cab5b1884a18036d81e66397
font_01_sfnt_off000056ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x56AC 10424 bytes
SHA-256: c3f7902730a02e323cc3c868d37b4bcfd7555f62a74cb0ff31bc6368fb9a6ea7

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