Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f43f4de95ea4dc8…

MALICIOUS

PDF

51.0 KB Created: 2020-08-20 11:14:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: f3266b5054092ac06df7901d5a2db18b SHA-1: 815750b0315afefba1a007f926bc4668b1d55fea SHA-256: 4f43f4de95ea4dc8f0e61b755ca120426283b85fb7abc465406c93380d242173
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'solving simultaneous equations worksheet kuta' and the malicious URL, suggesting a lure to a phishing or malware distribution site. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious redirector attack pattern.

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/pify?keyword=solving+simultaneous+equations+worksheet+kuta In PDF document text
    • http://files.uptonemporium.com/uploads/1/3/1/4/131437671/burizula.pdfIn PDF document text
    • http://files.serafinaconsulting.com/uploads/1/3/2/8/132814119/katuwixavafik_pojomesiramoros_mefuj.pdfIn PDF document text
    • http://files.mytempowalk.com/uploads/1/3/2/8/132815365/6598584.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/1/0433/0687/7080/files/46605756913.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8969/0773/files/fuvugomitaboguj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4098/7543/files/reference_evapotranspiration.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4460/8932/files/38335352036.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0956/3029/files/16_degrees_43_minutes_north.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8153/9489/files/xuvozidirisokavu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2135/2606/files/85890695248.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/4346/1032/files/88305737613.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4848/4507/files/nobepitijake.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7833/6166/files/2565427180.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6422/2101/files/jirixagabeposazunulu.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_off00007d58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D58 2828 bytes
SHA-256: a17885b4fd577e0298a64705d5055d2ac7c2363fd7008e9cf236b3df412a17d8
font_01_sfnt_off00008752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8752 5544 bytes
SHA-256: 2d8d47da06c60ee89d7a97385ffee2e9c86877dca874f3c0cba6e084900bdae2
font_02_sfnt_off00009a0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A0B 10000 bytes
SHA-256: 8af9a713037ce4c1c2ce54c0fa39d57659308e6a080e6c81af02bb96900435e3

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