Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d4ac1eac78f0b7a…

MALICIOUS

PDF

41.3 KB Created: 2020-08-30 03:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 421b5ae680f1144fb1c1fef0a3faa95d SHA-1: f4612030ddeb28a961a894a240e770b5da42fecf SHA-256: 2d4ac1eac78f0b7af968000262094ea9910de7e01ea8dbe5759f72db5d968bfc
194 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a link farm hosted on static.usrfiles.com. One critical heuristic firing indicates that the PDF links to known malicious redirector infrastructure via the URL https://ttraff.cc/wix?keyword=plural+forms+of+nouns+exercises+with+answers. This suggests the document is designed to redirect users to malicious sites.

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/wix?keyword=plural+forms+of+nouns+exercises+with+answers In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/7f16bd_bc37415270f2479abf0a3b24db58f6a2.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/c162b3_d8c3332ab61d42e69331682e0b0f2d70.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/98e298_0b0c621bb4f14bc0b717a0ba7d017ab8.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/ea2f88_fa667125e2e44c9bb29062ea9575636a.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_0394808d7bf8439389b815fea504f58a.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/4ae4db_04d7c5a5530e41fc859f4d44ffdceacd.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_c1c55af24b0a4521af701ff3025378bd.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_c2073b104cc74ced9fdaba9c8dc72939.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5856/9128/files/sagijon.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1506/1153/files/puzovir.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6926/8373/files/28747637867.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8679/1334/files/pdf_bronchopneumonia_anak.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b42fd6_aeb30b72cd7c45828f0824be1b078a1b.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_3afd7d5d8d3d48d780e46f3371c6f3cd.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 4

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_off00004fbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4FBE 5284 bytes
SHA-256: a8d475edad43cc4bf35b038c3d1c52cbbafbf63fdf2d51fcccd2d08eb83ccaf7
font_01_sfnt_off00006196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6196 9776 bytes
SHA-256: d5645e155ce81576f225dbadbe5d5e82ebb37749aee3528ced9ea73c86781420
font_02_sfnt_off0000833f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x833F 16076 bytes
SHA-256: 8ea7f1c1fa5cae84799308c3b5277d4d512d786787cd8f2796a1af00f3b64e48

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