Malicious PDF — malware analysis report

Static analysis result for SHA-256 1039bb28cac397ad…

MALICIOUS

PDF

55.2 KB Created: 2020-08-04 04:05:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 1cc8ed293832b59f3902423ffa46ad14 SHA-1: 79e53e8ba8005292304396dc688093ddf36b819e SHA-256: 1039bb28cac397ad5d5f3168fcab264a6e15fda95eb90a9e76297a4a9ed61f35
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links that point to a malicious redirector, disguised as a free download for medical terminology abbreviations. The heuristic firings indicate this is a link farm designed to redirect users to malicious infrastructure. While no scripts were extracted, the PDF structure and embedded URLs strongly suggest a phishing or scam attempt.

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=medical+terminology+abbreviations+pdf In PDF document text
    • http://files.wisteriasage.com/uploads/1/3/1/1/131163718/c599b09f19a7e.pdfIn PDF document text
    • http://files.blancplume.com/uploads/1/3/0/7/130776175/66fd80.pdfIn PDF document text
    • http://files.stamfordstrings.co.uk/uploads/1/3/2/6/132682868/wotibuno.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/1/0430/4073/5381/files/lexevujobutijuxivo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2505/5389/files/web-_config_wordpress.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/63912397784.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3600/0931/files/8502453416.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5293/3021/files/47318635525.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/21086069096.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0885/1098/files/netusar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9472/1187/files/sokufemerojigenedibesam.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2814/2501/files/kitebuxarasoke.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6579/2929/files/epson_xp_640_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6428/5598/files/59071604255.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 6

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_off00008d01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D01 5780 bytes
SHA-256: 55d1391bf98c365a14e119b80314f35dd24748af1dce27763aa4e62f0e4832af
font_01_sfnt_off0000a0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA0B0 15344 bytes
SHA-256: 33ab7641951d0c28efd57b0c36ca653f78f56853a891dbe6f2926541eacf8c0c

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