Malicious PDF — malware analysis report

Static analysis result for SHA-256 f970814a293f9a91…

MALICIOUS

PDF

45.5 KB Created: 2020-08-31 01:30:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: f021a0bf82664a9bc83bf2e5b46ad50e SHA-1: 7c0c05f34df8a7c7e8a4e43104828f35fa0f7577 SHA-256: f970814a293f9a9174224b395962c111c6d95e0fd6a6c2c4ad0f47edb5cdad4a
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, with one specifically identified as a malicious redirector. The document body, though partially corrupted, contains text related to 'Integer rules for subtraction' and references wkhtmltopdf, suggesting a lure document. The presence of numerous external links, including one to a known malicious redirector, indicates a likely attempt to direct users to malicious content or phishing 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.me/wix?keyword=integer+rules+for+subtraction In 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/1/0440/5395/4710/files/electrician_tools_and_equipment.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/9525543421.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8701/0715/files/high_performance_exhaust_shops_near_me.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9912/0033/files/30301052680.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1880/3610/files/zibunesazotivefo.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/3e9e83_ac2b84f344294204b0dbba247882464d.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4416/0156/files/58545182495.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0782/7364/files/31915249550.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/4749/4567/files/microeconomic_theory_mas_colell_solution_manual.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_8afbc1d284604938b04773cf9b93acff.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/d5cf39_d6d1586d4b3446f7b2cf7e8a88c9b6bf.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/3f80ec_c87022728f524d67a44044fa3bd02e40.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_e75fb7ffeecc407a85592424d02bffef.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_bd03473404844518865e89524af5adb7.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 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_off00005f91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F91 5128 bytes
SHA-256: de0044e3821b6fa84947140a9951008b2f68d712c49c32db8c7cd39a59b28fd4
font_01_sfnt_off00007110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7110 10036 bytes
SHA-256: 91d37c8a335763a3cfd5cf3f8d425c4f1a7fda8af1660f4f875a6460eab4ddc6
font_02_sfnt_off00009380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9380 16276 bytes
SHA-256: 339a92fb696ee81ef9ebb09a36a89a0552149f1e5217d7916235e62a5a8d340a

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