Malicious PDF — malware analysis report

Static analysis result for SHA-256 4875834108b2119e…

MALICIOUS

PDF

43.6 KB Created: 2020-08-15 18:39:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: b15198584d7269cce507267d978c49ec SHA-1: 91bc4e6856702f3b200d128b5a0b8ba5eb51ce08 SHA-256: 4875834108b2119e33f0a5ae64df6071909bb3d106ca9f5fbd4e47c7c25db7df
194 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though partially corrupted, suggests a lure related to 'Si units conversion worksheet answers'. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms the malicious nature of the redirector, and 'PDF_SEO_LINK_FARM' indicates a large number of outbound links, likely for SEO manipulation or to distribute malicious content. 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.ru/wb?keyword=si%20units%20conversion%20worksheet%20answers%20page%201 In PDF document text
    • http://files.thebridgechurchmt.org/uploads/1/3/0/8/130814065/kedewiwobed-zovej.pdfIn PDF document text
    • http://files.lisasearsart.com/uploads/1/3/1/4/131438641/4931054.pdfIn PDF document text
    • http://files.tyrendarraagriculturalshow.com.au/uploads/1/3/2/6/132695525/suwilafalutive-jusezopikuwajev-lefok.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7304/4642/files/92667636641.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2143/4005/files/14509878341.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8611/1137/files/wasoxebilowanozexoxoxu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0235/6127/files/buwumexelu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8184/2341/files/partnership_deed.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/taridulozomoxekolakinuku.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9252/3675/files/90901239347.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9322/0775/files/youth_football_spread_offense_playbook.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/5893/6473/files/install_gulp_windows.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 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E17 5416 bytes
SHA-256: c5c231830aa18954b28d32c79e7cf87f2fd2110c8696d91fe83b6c4b797b184d
font_01_sfnt_off00007090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7090 10224 bytes
SHA-256: b904264c16829ceb331a139d179ffe2176b346b29cb4fd132f69e27d66d7e0bb
font_02_sfnt_off00009367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9367 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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