Malicious PDF — malware analysis report

Static analysis result for SHA-256 f91b08a068324018…

MALICIOUS

PDF

42.0 KB Created: 2020-08-14 23:12:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: cb7e33dee30edc6105b348816b302981 SHA-1: 28f97827488e7b99e140e8530697b14f9003b9fe SHA-256: f91b08a0683240180b5d50c2e4e4c74e64aeb692991bf1c4971c5e557f27bc52
194 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a significant number of embedded links, many pointing to Shopify domains hosting other PDFs, suggesting a link farm. One of the primary links, 'https://ttraff.ru/pify?keyword=ereading+worksheets+point+of+view', is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to these URLs, reinforcing the attack pattern.

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.ru/pify?keyword=ereading+worksheets+point+of+view In PDF document text
    • http://rubufe.hikingnewfoundland.com/uploads/1/3/0/7/130775350/wabijixif-dagoruj-navutixem.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/1/0433/2643/9582/files/satibixeber.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7877/9029/files/78594398433.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4740/3168/files/welax.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7803/2296/files/respiracion_aerobica_y_anaerobica.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0105/2323/files/75492236279.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6731/0231/files/33255411465.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1007/1460/files/65484809910.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5651/9585/files/57976242656.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7495/3124/files/nupeneriloki.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0657/4238/files/14112091140.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3985/7572/files/48694349165.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0009/4112/files/11678565664.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4256/9383/files/pipixeramatexuxesap.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4249/5895/files/tripartite_agreement.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 1

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_off00006530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6530 5444 bytes
SHA-256: a0e612668f6501b7713a56d1683c69693a96746ba09ba08e4488e87c9c6cf83c
font_01_sfnt_off000077cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77CB 10440 bytes
SHA-256: 3dca0f584c454080bfa3174a516b481e2f253e81149c07e1c4e4da3c50f0fef0

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