Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa8724448b512702…

MALICIOUS

PDF

50.2 KB Created: 2020-08-19 23:33:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 2f7df9dac37dbf8a98234c78a62234d2 SHA-1: ba7042f9a4b0621378f301845540730cd0940280 SHA-256: aa8724448b512702cda992f30d6d37a907e801de368ba5d54998d2c41064ee60
194 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, identified as a link farm, with one prominent URL pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same suspicious URL, suggesting it is the primary lure. 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.cc/pify?keyword=neoplasia+de+pr%25C3%25B3stata+pdf In PDF document text
    • http://files.smartbrainenglish.com/uploads/1/3/1/0/131070469/6594031.pdfIn PDF document text
    • http://files.delbus.com.au/uploads/1/3/0/9/130969825/7489438.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7879/4917/files/jepimite.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3246/8904/files/40253011105.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9513/0266/files/rizalar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4977/0408/files/85213684498.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1175/8491/files/analysis_of_financial_statements_dk_goel_solutions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6556/3549/files/livitejexeramu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9455/6320/files/88825116317.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0533/0083/files/40063300653.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/4586/1014/files/harrison_bergeron_short_story_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0319/1193/files/60210062334.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9301/6222/files/kiwatusuxoxurar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/5823/1461/files/java_programming_tutorials_bangla_free_download.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 5

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000078df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78DF 4820 bytes
SHA-256: d4bce2a01f853e92bcdef54f021b33d65f46e27ad622503d5fc0dbd915553ada
font_01_sfnt_off0000890b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x890B 10692 bytes
SHA-256: 37dd5e03839fe08b8990fa8cbb6816f0a5457cf4e9e95ef4a7e36eae0e6ff961
font_02_sfnt_off0000abe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABE3 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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