Malicious PDF — malware analysis report

Static analysis result for SHA-256 635dc04d8ac26d7a…

MALICIOUS

PDF

41.9 KB Created: 2020-08-10 04:41:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 527fdcb10a8795f6223eafebc7ab13a6 SHA-1: d670e945def7536298299f13c45389194ef09fab SHA-256: 635dc04d8ac26d7ae37b8f51ef6078d40b0cdac33fe573f1d693abc05f09fa92
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many of which point to a redirector service designed to obscure the final destination. The primary redirector URL is identified as malicious, suggesting an attempt to lead users to a harmful site, likely for phishing or malware distribution. The document body and embedded links indicate a lure related to 'calligraphy practice book for beginners'.

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/pify?keyword=calligraphy+practice+book+for+beginners+with+worksheet+pdf In PDF document text
    • http://files.speckmath.net/uploads/1/3/1/4/131437666/daxomixolosotenon.pdfIn PDF document text
    • http://files.maydaystudio.com/uploads/1/3/1/6/131637546/162127.pdfIn PDF document text
    • http://files.b2w2.org/uploads/1/3/0/8/130874554/7810114.pdfIn PDF document text
    • http://files.raphaelacademy.org/uploads/1/3/0/9/130970003/xufidisuxig.pdfIn PDF document text
    • http://files.leverageleadership.org/uploads/1/3/1/8/131871618/fatopoxopovazib.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/1/0432/0123/3053/files/58899894792.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0638/5573/files/80318690679.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0247/8237/files/cricket_phones_walmart.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5871/6055/files/free_radicals_and_antioxidants.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9684/2142/files/gamedewita.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0454/8096/8342/files/afrikaans_dictionary_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9082/8700/files/27681068363.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/2283550224.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9799/0055/files/antagonista_y_agonista.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9659/5870/files/2894043453.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0070/9791/files/dopusin.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3196/9438/files/27416473140.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2246/7740/files/ratuxevokop.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6199 5720 bytes
SHA-256: dce0871878a44dcc204b1200506fdc4a2b130f3f2895d174b22737f6020e81de
font_01_sfnt_off00007520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7520 10736 bytes
SHA-256: 345757cf5c6011cca728584afe2790e6f6953ef8bdcd17c6a526951696ae9601

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