Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c9a073fe6722a36…

MALICIOUS

PDF

46.6 KB Created: 2020-08-20 11:53:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 5abd4e141bd75b72e1bf2ff592070ea0 SHA-1: e6ae8685285d4321efa89699cde400f65b2cfcca SHA-256: 3c9a073fe6722a369a4beab360b3693320ffabaa31d5b00190cdca08e8653b73
194 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external resources disguised as academic documents. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is likely used to obscure the final malicious destination. The document body, though partially corrupted, contains text related to 'bksb english initial assessment answers', suggesting a lure to trick users into clicking the malicious link under the guise of educational content.

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=bksb+english+initial+assessment+answers In PDF document text
    • http://babevaj.hoclincolnorders.com/uploads/1/3/1/0/131070374/cf79eaa62ecb5c.pdfIn PDF document text
    • http://files.darnhallparish.co.uk/uploads/1/3/2/6/132683264/simalaganopoguweje.pdfIn PDF document text
    • http://valena.sianyeshe.com/uploads/1/3/2/6/132682879/pibujinosa_vixilinudinut_visik_vaxezapukalenil.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/1/0432/3092/0871/files/bsc_3rd_year_inorganic_chemistry_notes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7176/6677/files/zitagonemebekasitipudade.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5353/0782/files/duxikuk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9112/4643/files/bedakow.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1658/5379/files/nureremadesa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5725/8401/files/gagizetozojaxiputazovi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0070/9791/files/25705798602.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/4123/2795/files/biological_theory_of_crime.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8900/2650/files/27637411019.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1290/6405/files/luxujani.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 3

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_off0000788b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x788B 5444 bytes
SHA-256: cf94250646c3554142da34721fee572fbaba8bd20d95d2d99f53c862d0bb2d6c
font_01_sfnt_off00008af3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AF3 10168 bytes
SHA-256: 8040883f822848481fb261d5f75aa1e0caa1861a7ef38f4be232eaa22030dbd6

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