Malicious PDF — malware analysis report

Static analysis result for SHA-256 63be3641ae5f570b…

MALICIOUS

PDF

45.5 KB Created: 2020-08-22 07:37:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: a655fbda1fe0d64c36d59ad15628efcc SHA-1: 5367b3f813f81958e83ce3a6fcef19b57a9c01a1 SHA-256: 63be3641ae5f570b871116e7ee92916489f32f21415266f883b5e17f1080accb
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links, many pointing to a redirector service (ttraff.ru) disguised as free worksheets. This suggests a phishing or scam attempt to redirect users to malicious content. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs supports this. No scripts were extracted, but the overall pattern is consistent with a malicious document designed to trick users into clicking through to a harmful site.

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=adding+mixed+fractions+free+worksheets In PDF document text
    • http://bufovuw.loyalseven.com/uploads/1/3/1/4/131454065/03672.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2436/7262/files/nowekewuviginoz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/5788/2022/files/gb_whatsapp_new_version_2019_march.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6812/9431/files/11903307074.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5387/5357/files/ghatna_chakra_polity_in_english.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0454/5295/1704/files/finite_automata_in_theory_of_computation.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71409998288.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6334/4294/files/manumawewalomusitedogi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3216/7068/files/jiwugot.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4285/6345/files/60418988751.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7777/1162/files/mafivodezuso.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 3

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_off00006570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6570 5404 bytes
SHA-256: c38f3c8af2f1ea10409cc862df6d30cd3668b1f2922b5360c1652ecb3173512b
font_01_sfnt_off000077ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77AD 10456 bytes
SHA-256: fa84ef502bf3f6fa1eeb17952dbc610415eb820aa198e580c2cb2a2c34849010
font_02_sfnt_off00009b52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B52 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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