Malicious PDF — malware analysis report

Static analysis result for SHA-256 c16c1fb175e57b69…

MALICIOUS

PDF

41.7 KB Created: 2020-08-12 23:05:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 3dc07e4071fcbf9c236b68012ed1d3b1 SHA-1: a72793f0a3be10d743d4a2d698a593efeb69c84d SHA-256: c16c1fb175e57b6976af83467e25772baaa583902d9ba4d10f5e5f1874915527
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, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. This suggests a link farm or SEO spam campaign designed to drive traffic to malicious infrastructure. The presence of the 'incremental sheet forming pdf' keyword in the malicious URL indicates a potential lure for specific search queries.

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/wb?keyword=incremental%20sheet%20forming%20pdf In PDF document text
    • http://files.elainehmacdonald.com/uploads/1/3/0/7/130739916/dajatupapi.pdfIn PDF document text
    • http://files.batrssocal.com/uploads/1/3/1/3/131384789/vipibifoxoteroxu.pdfIn PDF document text
    • http://files.beautyartistry.net/uploads/1/3/2/6/132695575/vumivej.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/1/0428/1230/9670/files/porob.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zemeletitofugawekabol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6951/2607/files/99665955762.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6151/8231/files/sawubuvalul.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6248/4383/files/16317548246.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/2522/5112/files/julovisoletofetovose.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5184/3737/files/6437152220.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9984/0921/files/becoming_a_better_person.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4101/3412/files/98538778309.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7956/5465/files/71466643380.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/4539/4331/files/96798251147.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5316/1367/files/kekikozi.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 8

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_off0000655a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x655A 5504 bytes
SHA-256: 39041aea0d25a5a83aef54c3aca0010cc2521204ce1c25579227072604501840
font_01_sfnt_off000077d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77D5 9944 bytes
SHA-256: 8dee629544592d63f03652c160c843679cdf98264ac4f8c1fad8e1162b1ed2ee

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