Malicious PDF — malware analysis report

Static analysis result for SHA-256 53b9bdd2ad9a03e7…

MALICIOUS

PDF

39.4 KB Created: 2020-08-08 06:26:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 7379dc93aa4933f1d09458d61815e05d SHA-1: 79fcf138993523e8ef747f8f0bcfcbec9ec8ec11 SHA-256: 53b9bdd2ad9a03e758bc48ad42bc2b6062b30866e47af77e35e58c9a7708768e
194 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to benign Shopify URLs, but one critical link to a known malicious redirector at `https://ttraff.cc/pify?keyword=algebraic+expression+notes+pdf`. This suggests the document is designed to redirect users to malicious content under the guise of providing academic notes. The presence of numerous links, including the malicious one, indicates a link farm strategy to potentially improve search engine ranking or distribute malicious payloads.

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=algebraic+expression+notes+pdf In PDF document text
    • http://files.michelleleblancshortstories.com/uploads/1/3/2/6/132681398/fosogixeboguz.pdfIn PDF document text
    • http://files.clevelandpropshop.com/uploads/1/3/0/7/130740563/9802076.pdfIn PDF document text
    • http://files.zardie.com.au/uploads/1/3/1/8/131856476/63a20684.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/1/0454/7497/1798/files/canon_lide_300_multiple_page.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5516/9179/files/73104085651.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3225/6407/files/fukoranivotamon.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9411/4453/files/ayurveda_cooking.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4864/0418/files/53513310079.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4915/6757/files/loxinekuwiwivejake.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xazijejizamoketabuguta.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9925/1093/files/23681005430.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3459/1907/files/449221907.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5989/4689/files/jifukuzavo.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_off00005a2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A2E 5520 bytes
SHA-256: da57c6b18b94507d1e0f3115651f455ee7964f4c2f2c230740151fcd7ba1b3c4
font_01_sfnt_off00006d08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D08 10588 bytes
SHA-256: 97ca36fa0d4b704018fd15ec7b4de5b145ace0dcf4c03050583a7a0a59ade0f6

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