Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3aca1b92ef75863…

MALICIOUS

PDF

43.6 KB Created: 2020-08-19 03:50:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 03cce1649fc88ce1057ea7811acf01ef SHA-1: 8dd4a9dedbcb5e0de4f9721b3f9edea317ac0848 SHA-256: c3aca1b92ef75863f3813f035c24ceab0b67bf4311c0bc61ea81283f2aa8c724
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, directing users to 'ttraff.ru'. The document body, though partially corrupted, contains text related to educational materials and embedded URLs, suggesting a lure. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm strategy to improve SEO and distribute malicious content. 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.ru/pify?keyword=addition+and+subtraction+flash+cards+pdf In PDF document text
    • http://files.techecohome.ca/uploads/1/3/1/4/131438847/vefuwuvun_bapaxexapidi_dobajemaxopizi_geberuza.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/1/0429/6556/5589/files/catalog_cable.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7539/4979/files/11862841050.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/3180/4574/files/giduxanokuwabojo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1520/8098/files/public_ntp_servers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0447/4172/2261/files/zobab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7284/0090/files/simple_and_compound_interest_worksheet_kuta_software.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/0673/6037/files/architect_resume_template_microsoft_word.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9340/8409/files/28276166364.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8901/1612/files/slope_stability_analysis_book.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 1

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_off00005d77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D77 5136 bytes
SHA-256: e4881c0d03a21fd6140cde0121c4355b0336fc0fd2fbc5d7c5ad5a4b220ceb1d
font_01_sfnt_off00006ed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6ED2 10920 bytes
SHA-256: 1008813747995575ce38d4adbdc928f817cca5945922340800b3fe4c4963b8dc
font_02_sfnt_off000093b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93B4 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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