Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca8243c569371340…

MALICIOUS

PDF

41.9 KB Created: 2020-08-17 10:57:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: a09ee14e7068ee6228f07c90ff0a12c5 SHA-1: 0323a9403b5d60553dfd5ac87248d292218f37bd SHA-256: ca8243c569371340655ed4497c0e4cd103a989941747d4372710370f70c7840f
194 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it points to known malicious infrastructure. Additionally, PDF_SEO_LINK_FARM suggests a large number of outbound links, many of which are likely malicious. The ML_NYX_PDF_MALICIOUS classifier also strongly flagged this file. The document body, though heavily obfuscated, contains a URL that appears to be a lure for an academic essay, which is a common social engineering tactic to encourage clicks on malicious links.

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=hamlet+character+analysis+essay+pdf In PDF document text
    • http://files.cherissethurab.com/uploads/1/3/2/6/132695408/179deb2.pdfIn PDF document text
    • http://nerosale.homefrontherald.com/uploads/1/3/1/4/131407815/8897933.pdfIn PDF document text
    • http://files.sandiegoiaido.com/uploads/1/3/0/8/130813765/3131509.pdfIn PDF document text
    • http://files.monroecounty2020.com/uploads/1/3/1/6/131637177/lotajumamarevu-jebenojemojufu.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/1/0431/7652/5984/files/infeccion_del_cordon_umbilical.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9403/9975/files/inverse_matrix_in_r.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2283/4071/files/bepuwojoguxorezijogi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4131/6249/files/72022326170.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7440/5020/files/73049240848.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7068/4317/files/18040950088.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2464/5272/files/logic_gates_using_diodes_and_transistors.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9328/5277/files/35478070959.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3713/0914/files/cor_in_r.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/35535883354.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0454/1834/8712/files/46559518768.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 4

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_off00006661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6661 5456 bytes
SHA-256: 95d74f07a04ba86d105c8f0524be6ffb0437b4f9f4b129c7f126ae0f50bccf02
font_01_sfnt_off000078cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78CD 9980 bytes
SHA-256: 006388c1cde738263622ee80dcfc09b0a5d3386f1fc4263d93400e55887a2d49

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