Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dffe77a0086e8b7…

MALICIOUS

PDF

48.1 KB Created: 2020-08-09 04:38:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 4b73c5022d15142f295f0650ece9e028 SHA-1: 78c5fea6d7467df468e3df0c8c81cc5e65e3d4aa SHA-256: 6dffe77a0086e8b7169b0d101989615c974dc46af0c67e6322e8a69737cd972a
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one to a known malicious redirector, suggesting a phishing or scam attempt. The document body, though heavily obfuscated, contains text related to 'completing the square problems with solutions pdf' and the malicious URL, indicating a lure to trick users into clicking the link. The ML classifier also strongly flagged this PDF as malicious.

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=completing+the+square+problems+with+solutions+pdf In PDF document text
    • http://files.cameronhighlandshomestay.com/uploads/1/3/1/3/131380741/7867893.pdfIn PDF document text
    • http://files.octws.ca/uploads/1/3/1/4/131437402/ludisebanu_zidekewegofemu.pdfIn PDF document text
    • http://files.g2gdrivingacademy.com/uploads/1/3/1/4/131437318/9642682.pdfIn PDF document text
    • http://files.conductorbeverlytaylor.com/uploads/1/3/0/7/130776458/tugabujuduwu.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/1/0438/3680/1184/files/62828868648.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9292/6873/files/thinking_in_java_5th_edition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8910/7869/files/65646007202.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5863/3631/files/i_walk_the_line_tab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6676/1120/files/xadexuwewipibiduba.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5934/7618/files/36947073872.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9186/1410/files/natadoxef.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0360/8216/files/inorganic_chemistry_notes_for_bsc_3rd_year.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7955/7539/files/56164841618.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3613/7882/files/padusuwasavivinum.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6821/0852/files/rojukejiwuriv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5366/8769/files/pi_in_hex.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_off00007c12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C12 5720 bytes
SHA-256: 0335872047abdb0b84234fa2d3a19b13b5b7c4e1b96c7315290c13860b0c8202
font_01_sfnt_off00008f5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F5B 10508 bytes
SHA-256: 0c4926467182771893c194f86873cae4c87d0fbc4ad96e257f18a7c332a3b738

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