Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff85f3472f0c9675…

MALICIOUS

PDF

37.1 KB Created: 2020-08-25 13:50:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 14aedb4aff6d3f2af4c8c843c4d98c88 SHA-1: 665450b057ffffa6cf5da5ed58854dd7cca4e58a SHA-256: ff85f3472f0c9675f56d3be0929909c4888f998044b269141b15ebc9710a7383
194 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to Shopify domains, but one critical link redirects to a known malicious URL (ttraff.cc). The ML classifier strongly flagged this PDF as malicious. The document body, though partially corrupted, contains the text 'Singapore calendar 2019 with public holidays' and the malicious URL, suggesting a lure to trick users into clicking the link. The primary attack vector appears to be directing users to malicious infrastructure via embedded links.

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.cc/pify?keyword=singapore+calendar+2019+with+public+holidays In PDF document text
    • http://files.stevewanna.com/uploads/1/3/1/6/131637374/kalodizosodugikaka.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/1/0429/8565/2375/files/16587251942.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0820/4704/files/90212657000.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/7989/1099/files/97662834765.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7886/7354/files/wesixuwasominazigukeduk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/9906/0392/files/luxubogozikabogefegivi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6756/2392/files/bamu_bsc_biotechnology_syllabus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6310/5953/files/20697435413.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3446/0828/files/testprep_70-_697_configuring_windows_devices_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/3694/9152/files/naragabateru.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5666/8573/files/i_speak_six_languages_sheet_music_scribd.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 2

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_off00004f84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4F84 6256 bytes
SHA-256: 22fcf2c3497f5f8c2be556230e68e1792d8299254d0e7fdb4f145909d4ea2234
font_01_sfnt_off000064c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64C0 10240 bytes
SHA-256: 710f663a1e4dbe59e961574f6bdb9ba9c0b4403f112d41b18c28051e84269085

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