Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb8ac43b0b02248e…

MALICIOUS

PDF

37.4 KB Created: 2020-08-03 12:52:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 34c4bbf9aadb0fb83f77fb2692542812 SHA-1: 33734a7350e49925d8c33c994b02f8d8b95287fc SHA-256: fb8ac43b0b02248e4b4d08ce9df8c80a410fd19f79edd82874d951943a6114ed
194 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=reading+strategies+book+by+jennifer+serravallo+pdf'. The document body also contains this URL and numerous other PDF links, suggesting a link farm or redirection tactic to distribute malicious content. The ML classifier strongly supports the malicious verdict.

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=reading+strategies+book+by+jennifer+serravallo+pdf In PDF document text
    • http://files.shoptherapynoho.com/uploads/1/3/0/8/130814124/7243968.pdfIn PDF document text
    • http://files.my-early-morning-thoughts.com/uploads/1/3/1/4/131407106/xezowewamut.pdfIn PDF document text
    • http://files.strengthasoneleadership.org/uploads/1/3/2/8/132814220/pebuduzawebojo.pdfIn PDF document text
    • http://files.edmondssonsofnorway.org/uploads/1/3/1/4/131453527/5350226.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/1/0432/1037/5325/files/borutakagemaj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9282/8579/files/lajumatugujop.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6956/2266/files/napavunanapetowumopaw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4419/2935/files/jadilinon.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3503/1712/files/zewavizomezixo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6993/1673/files/pete_s_opengl2_driver_2._9.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/0611/3430/files/gatoziwapokejapulefupegap.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7245/4807/files/kemivitobitedebejokopawa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0507/4838/files/6508820545.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 4

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_off000053c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x53C6 5656 bytes
SHA-256: 6dab4e86ff3fcde7dba24a8d17ae2ef46281117a29c3df61b2c0ad0b8a0c1678
font_01_sfnt_off00006731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6731 9768 bytes
SHA-256: d45178e6e8307076f6971a58d519b755588827bf2888ade8e7b34b80f4c31b5f

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