Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bcb6440a830ab7d…

MALICIOUS

PDF

41.9 KB Created: 2020-08-09 14:29:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: b2444ab9152b17e41c52f93212174bd5 SHA-1: 7f2b4de0dae84e47ea15f5e7023827dd50aef0c5 SHA-256: 5bcb6440a830ab7d638a460b3578915ec56297d378dbc7089902d8bc2f04c05f
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm designed to appear as a free download, but it redirects to a malicious URL. The heuristic firings indicate the PDF is a redirector and part of an SEO link farm, likely for phishing or malware distribution. The ML classifier also strongly flagged this PDF as malicious.

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=eversafe+fire+extinguisher+pdf In PDF document text
    • http://files.lameracandelaria.com/uploads/1/3/1/4/131409709/fosegupumaje_faledapaxu_tolujafevi_savevabizu.pdfIn PDF document text
    • http://files.encircledbirth.com/uploads/1/3/0/7/130739021/kejiban-nirizopadaso-dinigabiripinok.pdfIn PDF document text
    • http://basowu.belunasoap.com/uploads/1/3/1/1/131164250/watifugi.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/1/0428/9835/8432/files/wonazonuv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6053/5196/files/85506427410.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9802/1793/files/convert_english_to_chinese_text.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9318/1081/files/dalomeperovefisamal.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9932/4580/files/46133622421.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0275/7281/files/25710333353.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2758/6472/files/free_rp_codes_list_2017.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/5516/7126/files/tejunuxexabikovatib.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6452/3926/files/79053442187.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4855/1068/files/45496304109.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/0772/0094/files/37082757998.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9170/5500/files/somewopolibi.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65B8 5356 bytes
SHA-256: b7a108b0a5c8cafffa9135935a156d7d0c1e2b72f45f44428660ecf3466ac723
font_01_sfnt_off000077f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77F8 10356 bytes
SHA-256: 8c6ec71dca647a99bfda51ea3cd85de5298e406c114c89697b54274acf4eda03

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