Malicious PDF — malware analysis report

Static analysis result for SHA-256 23a531b09f7f1c51…

MALICIOUS

PDF

40.3 KB Created: 2020-08-19 06:22:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: fea52081eedce3217b575f819eaa861f SHA-1: ee54ab409d2c448bf7a391973d6611b4a40240f2 SHA-256: 23a531b09f7f1c519ecc9770a78659d30296a17c55817e0fc8a9e4e5b2c004f0
194 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with one identified as a known malicious redirector. The document body appears to be malformed or obfuscated, but the presence of a link farm and a malicious redirector strongly suggests an attempt to lure users to malicious sites. No scripts were extracted from this sample.

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=castor+informatique+s%2527+entrainer+2016 In PDF document text
    • http://kixod.flexypakofli.com/uploads/1/3/1/3/131380983/175171.pdfIn PDF document text
    • http://jafini.drlchen.com/uploads/1/3/1/4/131407901/8939f5b2.pdfIn PDF document text
    • http://files.allaboutherexpos.com/uploads/1/3/0/7/130775145/veluguwikofala.pdfIn PDF document text
    • http://xetit.northshorejewish.org/uploads/1/3/0/9/130969060/46b722eb0040c03.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/1/0434/7992/4893/files/99695105853.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8850/2174/files/acls_manual_2020_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6599/8501/files/barbie_doll_clothes_patterns.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/16949815227.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8669/9925/files/second_law_of_thermodynamics_ebook.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4504/3876/files/78052881224.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9802/9733/files/dead_trigger_mod_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0910/6335/files/womidexukowuxu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/5883/7142/files/what_is_a_slug_in_wordpress.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6365/7119/files/jevoviresifezokikevowusa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3559/8758/files/towise.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_off00005f44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F44 5428 bytes
SHA-256: 33f2561321ecf1c44edfe23b7f9fc010d9d24262745b9709ed377ad833a7335a
font_01_sfnt_off000071af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71AF 10120 bytes
SHA-256: 7ee460baafd59e3f47e4ee745905077a563f8300346d07e06caa218bf98750b3

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