Malicious PDF — malware analysis report

Static analysis result for SHA-256 51798794c98ff14e…

MALICIOUS

PDF

47.9 KB Created: 2020-08-06 10:49:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: aa1d58e7dd503f51347090840ff28453 SHA-1: f8edac2cdd5b2849d35fb407cce6b5efe66afa0d SHA-256: 51798794c98ff14e4147292e1193b7fb502a4d868c49b984167dd2a1fac7e159
194 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link and a large number of external PDF links, indicating a link farm designed to obscure malicious activity. The primary malicious URL identified is https://ttraff.ru/pify?keyword=reading+comprehension+activities+pdf, which likely serves as a gateway to further malicious content. The ML classifier also strongly flagged this PDF as malicious.

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=reading+comprehension+activities+pdf In PDF document text
    • http://files.myjesusdream.com/uploads/1/3/0/7/130739227/3375386.pdfIn PDF document text
    • http://warelidid.3am.ency-education.com/uploads/1/3/0/7/130776760/nafitem_wufuwixi_vukefape_garoka.pdfIn PDF document text
    • http://files.tuskiescurbside.com/uploads/1/3/1/6/131606965/6016394557d2.pdfIn PDF document text
    • http://files.mnbtradingpost.com/uploads/1/3/1/3/131378932/papubivuri.pdfIn PDF document text
    • http://files.mountaincelebrations.co.uk/uploads/1/3/0/8/130813378/6210473.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/1/0432/5661/0969/files/hollywood_forever_cemetery_map.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0156/0737/files/xugubux.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xopiforosolakalaxelavur.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3421/4561/files/53961947850.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3236/3676/files/89264860513.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4318/2999/files/web_development_in_php_tutorial.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5080/3099/files/97099035862.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/48054684450.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2399/8874/files/65055675695.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8996/9820/files/ibps_rrb_admit_card_download_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/1261535930.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4678/8502/files/52495912373.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 3

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_off00007c0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C0F 5604 bytes
SHA-256: 69ab9b497ddc551e0793801888354935487d1af9e12bf639d997cdbe3a1e7a3e
font_01_sfnt_off00008f07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F07 10252 bytes
SHA-256: 028e3e6b37e237b92cf25b7a4235f95f26e1609d52a270332c521a35c50d4494

Open this report in the interactive analyzer, or submit your own file for analysis.