Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d43cb0a64b8c2b5…

MALICIOUS

PDF

43.0 KB Created: 2020-08-05 14:30:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 2ecac00d4e8c5088c935283f867f9928 SHA-1: ad62b2e732df741a0cfb80f20f32109322dde592 SHA-256: 1d43cb0a64b8c2b5ce999ac3bf578e1e5aaa044c6eeb43f79963fd4ed4b19fe7
194 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one URL pointing to a known malicious redirector. The document body text, though partially corrupted, includes the string "Bss telecom pdf" and the malicious URL, suggesting a lure to trick users into clicking the link. The ML classifier strongly indicates maliciousness.

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=bss+telecom+pdf In PDF document text
    • http://files.simplysailing.ca/uploads/1/3/1/8/131856852/1930131.pdfIn PDF document text
    • http://files.americaninteriordesigncenter.com/uploads/1/3/2/7/132710592/8588257.pdfIn PDF document text
    • http://files.inzei.tokyo/uploads/1/3/1/3/131380163/72e00a.pdfIn PDF document text
    • http://files.belindadurrant.co.uk/uploads/1/3/0/9/130969984/6264493.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/1/0428/6332/9446/files/16818382137.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5797/9304/files/68810768056.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6638/2746/files/komasedopufojugabitenun.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4203/7150/files/traffic_highway_engineering_th_edition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4436/4710/files/69182407990.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zaxolaxowixinetubosi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0500/8293/files/26519521586.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9018/2304/files/vipidifatiserivitofafo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/3865/3081/files/runujobusogewaxiwujuwub.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3183/8368/files/vizio_code_for_directv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/0444/2262/files/reredokorekuvowe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6394/3067/files/papomesutomode.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9098/3574/files/zoralu.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A02 5044 bytes
SHA-256: 5fbe60a712a6a1d7b56d453756e963dbc7b0f920218b66aab35c153a7d6c5749
font_01_sfnt_off00007b21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B21 10692 bytes
SHA-256: 17f5a54457f0e21ca24c278875c202474fcdda4fd3ea543d3e799b51afb9d0bd

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