Malicious PDF — malware analysis report

Static analysis result for SHA-256 16f0a5d8c0b666b7…

MALICIOUS

PDF

40.9 KB Created: 2020-08-06 23:28:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 6be296aa54a43038ced037e08739a7de SHA-1: eee937229613f144971e2d4e1ec0d1368a364963 SHA-256: 16f0a5d8c0b666b713d83ce8ef2930cd5e8aa52ead9cedc3b11c6f05bef9f5fb
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to redirectors and SEO link farms designed to obscure the final malicious destination. The primary redirector identified is https://ttraff.ru/pify?keyword=chinese+calligraphy+practice+paper+pdf, which is flagged as malicious. This indicates a phishing or scam attempt leveraging a lure of free downloadable content.

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=chinese+calligraphy+practice+paper+pdf In PDF document text
    • http://files.devizesfinekitchenswiltshire.co.uk/uploads/1/3/0/7/130776406/lijodizivetof_wemomofiwu_nubekegezagaro.pdfIn PDF document text
    • http://files.phsboosters.org/uploads/1/3/1/4/131438180/d894aa6088690.pdfIn PDF document text
    • http://files.smwunlimited.com/uploads/1/3/0/9/130969313/7404020.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/1/0438/0377/1041/files/48159527094.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/2904/3099/files/tajakimuwupexabeto.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4790/2629/files/23953846013.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5209/0022/files/57178413654.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7218/3703/files/46412061624.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2729/2582/files/60396922269.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2440/1063/files/23579016139.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8199/0304/files/94887047972.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2392/4376/files/92003909152.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/6705/7063/files/79979683167.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1970/6269/files/jadodizajinijep.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_off000060be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60BE 5424 bytes
SHA-256: a0fce8a566b5283e1fbe011c2f37dad02ab7727951cfd03e0c71aedf340a6471
font_01_sfnt_off0000732e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x732E 10540 bytes
SHA-256: 3e1f1a65297241decf37f2d40ef32f15ed2ce5eaa3ade6ff296888aac19b7a22

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