Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3a6edca72413f1c…

MALICIOUS

PDF

43.2 KB Created: 2020-08-10 02:42:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: dc7f5416769ec169e596ac6753d57c63 SHA-1: 4f28edff4d5f53ad3a6f8d104385d44ad50af578 SHA-256: a3a6edca72413f1c8b76beeb0f6b7d81ad3d9d4df4c52dbd1ca2f9e6f16aa827
194 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources. One critical heuristic firing indicates that the PDF links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure. The ML classifier strongly supports the malicious nature of this PDF.

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.ru/pify?keyword=nikola+tesla+books+pdf In PDF document text
    • http://files.cohinteriors.com/uploads/1/3/0/8/130814907/9053380.pdfIn PDF document text
    • http://files.positiveculture.org/uploads/1/3/2/3/132302894/6944347.pdfIn PDF document text
    • http://files.obriendevelopments.org/uploads/1/3/1/3/131397987/adbd9b1bb63.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/1/0435/5004/8420/files/bengali_english_calendar_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8555/2034/files/belimbing_wuluh_untuk_hipertensi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6728/4387/files/big_ideas_simply_explained_politics.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6385/9605/files/samsung_mtp_driver.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0988/4838/files/expand_all_columns_excel.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7124/2389/files/zenanigilabofonoliwetu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6628/5464/files/58430359383.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6278/0311/files/vexiwezususuba.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3651/5224/files/19068989107.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3459/1907/files/96543468482.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5802/8959/files/51727889676.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 2

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_off0000694b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x694B 5112 bytes
SHA-256: 8442198728880bcdd0de3a0d16493578a7eecfc840629b29b39036adac74a73d
font_01_sfnt_off00007ac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AC6 11048 bytes
SHA-256: 0a2769d0b632af3e9f3b32053227e9283e8b35cbe59fc8c1259c3937603aa5a2

Open this report in the interactive analyzer, or submit your own file for analysis.