Malicious PDF — malware analysis report

Static analysis result for SHA-256 e344137976f890fa…

MALICIOUS

PDF

35.5 KB Created: 2020-08-15 09:26:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 8737cee59389a55074b3e1a93ed1d719 SHA-1: 12a89d82691f136982374f3db9e9ecfbcc751424 SHA-256: e344137976f890fa04c2114e2d6eb4f93e3504b1d8f06cdc2455425c0e016d75
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with the primary heuristic identifying a link to a known malicious redirector. The document body, though partially corrupted, contains text related to 'sentence construction worksheets ks1' and the malicious URL, suggesting a lure to disguise malicious activity. The presence of multiple external PDF links further supports the SEO link farm heuristic, indicating an attempt to distribute malicious content.

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.com/wb?keyword=sentence%20construction%20worksheets%20ks1 In PDF document text
    • http://files.clickitandcartit.com/uploads/1/3/1/8/131856770/0f6814b4.pdfIn PDF document text
    • http://files.stickwithitpalette.com/uploads/1/3/0/7/130776500/28b6664b447bf13.pdfIn PDF document text
    • http://files.brandonrdavis.com/uploads/1/3/2/6/132682471/dibasefawalabuneviz.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/1/0437/3970/9605/files/mario_vazques_gallery.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0997/3147/files/apprentice_attendance_sheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2402/3715/files/laruwiwudozukikolefekuka.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7070/8129/files/gatutilunugovuziwokefa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6554/8705/files/10103437618.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0443/0499/0364/files/bitwise_operators_in_java.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6971/9196/files/puwafimun.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3708/2271/files/gotovojabekoje.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3287/1074/files/number_properties_gmat_strategy_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6649/1031/files/sawizazebanavebikabidifox.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_off00004f5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4F5E 4956 bytes
SHA-256: 29d2052809b0989a23844f89c10fcad49f286afc86cdbc39af932372d7b50862
font_01_sfnt_off0000604f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x604F 9712 bytes
SHA-256: e60548d0625b7fa2f2ce737964b1c060f938bbdb4726e7be13dd886307748b6d

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