Malicious PDF — malware analysis report

Static analysis result for SHA-256 18be338fc4b16e45…

MALICIOUS

PDF

44.3 KB Created: 2020-08-13 18:20:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: ad5792c131db253962bededcddcb964f SHA-1: 6e796945d2428b3664ee7adabc49e2a2830daf77 SHA-256: 18be338fc4b16e456735c9663a8df7c625d6e309d1d0f643b6e9530190be24e6
202 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to a redirector infrastructure, suggesting a link farm or phishing lure. The presence of a 'download button' heuristic and a critical finding for a malicious redirector link indicates the primary goal is to direct users to malicious content. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wb?keyword=medical%20power%20of%20attorney%20form%20nc%20pdf In PDF document text
    • http://files.hostessjobitaly.com/uploads/1/3/0/9/130969153/riruwowam_luzegiretuzen.pdfIn PDF document text
    • http://files.empactathletics.com/uploads/1/3/0/7/130738712/85a4574561198.pdfIn PDF document text
    • http://files.sbtcandles.com/uploads/1/3/0/7/130775918/venanet.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/1/0437/3377/8597/files/27352531463.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7415/0809/files/69200507236.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2658/6519/files/82279045913.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4888/6684/files/minecraft_op_factions_servers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7743/5556/files/bengali_astrology_book_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8486/3893/files/35209150819.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8901/0593/files/5231384402.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5307/2022/files/23915643371.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nulanevu.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_off00006f1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F1B 5324 bytes
SHA-256: 346b5dd5e63a98fbc92a5b431c84cf9e8944e67259e9f57776bffc975b59cbde
font_01_sfnt_off00008137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8137 10412 bytes
SHA-256: f6ad8328f770ca8e61a557e572e8b0709ccc39e56c6650ea3f8a9e9f419822e9

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