Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b25dc8282ff22b5…

MALICIOUS

PDF

51.3 KB Created: 2020-08-03 05:16:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: bb9a39899ea10ae575789b4371f04b11 SHA-1: 2f8b2af70d844d743cf17f1c12886a4134982841 SHA-256: 7b25dc8282ff22b54303ee26d8c5ed266c6874a4a1fca7dd941ed64aa355ed1e
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a critical heuristic firing indicating it leads to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text that appears to be a lure for 'Blitzer college algebra pdf'. The ML classifier strongly supports the malicious verdict, and the presence of a link farm suggests a phishing or scam attempt.

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.com/pify?keyword=blitzer+college+algebra+pdf In PDF document text
    • http://files.kristindahlhomeloans.com/uploads/1/3/2/6/132695668/ziwituwesuxofiruf.pdfIn PDF document text
    • http://files.steepyourcuriositea.ca/uploads/1/3/0/7/130775223/vilisal.pdfIn PDF document text
    • http://files.rmmfoundation.org/uploads/1/3/1/3/131379971/mudugu.pdfIn PDF document text
    • http://files.carolinamunozparra.com/uploads/1/3/1/8/131856173/34d2f38d451.pdfIn PDF document text
    • http://files.annekawalker.com/uploads/1/3/2/7/132740352/sadixiva-vuzaxeri-gipowo-liwaka.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/1/0430/7196/3296/files/70674390118.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7634/6266/files/zijigajitetel.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3202/6008/files/84516825556.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/84860081798.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1656/9500/files/43512179021.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/3152232763.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6761/3087/files/megetik.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2861/9168/files/87141767125.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3858/8584/files/71929045918.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6043/5873/files/suvenovevowejevibagi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1089/1680/files/45096709022.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8777/4374/files/dinonazaru.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6578/3958/files/south_lomei_labyrinth.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 6

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_off00008a03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A03 5384 bytes
SHA-256: bef78895009178a9e924030aa4f20e06d6c0176beba9ce2d5a772ac041ec329c
font_01_sfnt_off00009c6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C6A 10724 bytes
SHA-256: 9595f9f0956292e6a9cadf40de624696338506925a1938d69fa6fb0ed0c0a3ec

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