Malicious PDF — malware analysis report

Static analysis result for SHA-256 851705c0dfc2cdaf…

MALICIOUS

PDF

48.1 KB Created: 2020-08-09 00:41:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 72a01187032cf1220bc9d8aea6e1bfc9 SHA-1: b39eb92d388135033f4a9fb198eb4eb70cfeae5b SHA-256: 851705c0dfc2cdafd28820304d4e143f1c5c3301fa97a8cebefbd0733e109efd
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links designed to create an SEO spam farm, with a critical heuristic firing for a malicious redirector. The primary redirector URL, https://ttraff.ru/pify?keyword=ebook+akuntansi+dasar+pdf, is used to lure victims with a fake ebook download. This indicates a phishing or scam attempt, likely to lead to further malware delivery or credential harvesting.

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=ebook+akuntansi+dasar+pdf In PDF document text
    • http://files.barcelonasailingcharter.com/uploads/1/3/1/6/131637606/13ce8e33.pdfIn PDF document text
    • http://fefijut.thefurnishedboudoir.com/uploads/1/3/1/0/131070450/telegog.pdfIn PDF document text
    • http://files.buttehomelesscoc.com/uploads/1/3/1/4/131406701/0b845223c69.pdfIn PDF document text
    • http://files.warandthecanadianexperience.com/uploads/1/3/1/3/131379231/pivetufid.pdfIn PDF document text
    • http://files.aeskelly.com/uploads/1/3/1/8/131856937/3847096.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/1/0440/0149/3142/files/neonatal_sepsis_nice_guidelines.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4283/9455/files/afrontamiento_del_duelo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2869/9553/files/mysteries_at_the_museum_episodes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0234/7168/files/gyarados_coloring_page.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8266/1532/files/morphology_of_flowering_plants_notes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5940/4197/files/41377068965.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3667/2162/files/xejawogagojuzexuj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4021/1105/files/17393500512.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7577/8198/files/organic_chemistry_study_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2073/0020/files/72249109651.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 6

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_off00007f21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F21 5164 bytes
SHA-256: fe3f5864d2d35feb4a1ca6438e73db869c53b4a5b371686bb15863ff40190c01
font_01_sfnt_off000090be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90BE 10192 bytes
SHA-256: 8aaf045892ec25e8bafc73f580ab4369d47ee067facff4d0ddb671f50e3d3ca1

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