Malicious PDF — malware analysis report

Static analysis result for SHA-256 77f3c156ef9b51dd…

MALICIOUS

PDF

45.4 KB Created: 2020-08-17 17:31:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 1c2e64fcb298ecade771a5afc8f7e619 SHA-1: 3dfe0f00a08fa69cd0e2764e85e9cf6fa84d9889 SHA-256: 77f3c156ef9b51dd5661f8aaa738143402de90f3eddf9839ef3be9b990feff4f
194 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with a critical heuristic firing for a malicious redirector URL (https://ttraff.ru/pify?keyword=orbit+er+linux). This URL is presented as a lure, likely for phishing or to download a secondary payload. The ML classifier strongly indicates maliciousness, and the overall structure suggests a link farm designed to drive traffic to malicious sites.

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=orbit+er+linux In PDF document text
    • http://files.dioperez.com/uploads/1/3/1/4/131482952/zomevumujip_mofarife.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/1/0431/5024/6054/files/38447361567.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8228/5216/files/convertir_de_a_word_small.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5840/5274/files/ponufuzevawosewixite.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8180/9558/files/fobufavirutidop.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1656/8487/files/lupajuduki.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/50878135704.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5099/0753/files/68126819900.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/0364/7912/files/global_food_and_beverage_industry.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1663/4016/files/parasuvuwebakejez.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1617/4237/files/48453506068.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_off000076f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76F3 4528 bytes
SHA-256: a17f64239151e44799117608e244f53228161a505a1d8cc5da129b951161cca4
font_01_sfnt_off0000866a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x866A 10128 bytes
SHA-256: 9ee75f42761ec80414822cc660643494a7cc196bdefcf39022d39350920cd0d2

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