Malicious PDF — malware analysis report

Static analysis result for SHA-256 66efddf4aa186890…

MALICIOUS

PDF

44.8 KB Created: 2020-08-03 04:40:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 8efb0f91b56d61bf13feb0763061d3e9 SHA-1: 8a4288429d323fca1c51978e23c237a6eb2e5bac SHA-256: 66efddf4aa186890c3ccab7a74e7fe78b1521e0bf62c842de7e8b8ff120fc9ae
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which point to a redirector infrastructure known for hosting malicious content. The primary redirector URL is https://ttraff.ru/pify?keyword=acer+c720+chromebook, which is used to disguise the malicious intent as a free download lure. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests an attempt to distribute malware or phishing 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=acer+c720+chromebook In PDF document text
    • http://files.mackenziebellfineart.com/uploads/1/3/1/4/131406498/dixakod-bikemekozofope-vurudi-lubepuwodawux.pdfIn PDF document text
    • http://files.observationsandconclusions.com/uploads/1/3/1/1/131164424/499063.pdfIn PDF document text
    • http://files.met-track.com/uploads/1/3/0/7/130739154/venakupovev.pdfIn PDF document text
    • http://files.horseandbird.com/uploads/1/3/1/3/131398164/6147944.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/1/0433/0687/7080/files/7614883084.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5187/5494/files/16768376551.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8617/5651/files/pow_function_python.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5467/7662/files/63915203003.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9217/3217/files/72093494144.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7974/6201/files/mojalodenufokatipalorigis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9252/4702/files/xusaberaxiwokof.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5702/9018/files/vk7jg_nphtm_c97jm_9mpgt_3v66t.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7211/7141/files/fikokuvug.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8283/3308/files/ronobafojekewemaz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6137/9226/files/for_the_king_cheat_engine.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1103/7589/files/topazinamezumole.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_off00007286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7286 5164 bytes
SHA-256: 812467d756306cf72a50c4f59aef5077e3ac787c0aaa5a39df37adcaae04bc8f
font_01_sfnt_off000083ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83FF 10056 bytes
SHA-256: b2769961017d31800536958a9d0305d2ee872d0f1b492dc4509d28add182ef75

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