Malicious PDF — malware analysis report

Static analysis result for SHA-256 e251f4bcb2f2d052…

MALICIOUS

PDF

58.1 KB Created: 2020-08-19 21:05:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: c05ee62748098f2e0cc6772fb0c7e388 SHA-1: 437a9e84a4f0b0e67d64d0124f4bcdd0ba1c8b12 SHA-256: e251f4bcb2f2d052fe584b55ea98023a0fba94c6cc29536373ffd26f4dcecb9e
234 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, also contains the URL 'https://ttraff.ru/pify?keyword=anamnesis+pdf+concepto', suggesting a lure to a malicious site. The presence of a link farm further indicates an attempt to distribute malicious content or traffic. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • PHP webshell / backdoor source high WEBSHELL_PHP
    The file contains PHP server-side code with the signature of a webshell/backdoor (request input fed to a command/code-exec sink). A webshell takes attacker input from an HTTP request and runs commands/code on the server. Flagged as a malicious hacktool artifact even when carried inside a document or archive — the code does not execute from the carrier, but the file is a webshell.
  • 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=anamnesis+pdf+concepto In PDF document text
    • http://rodetin.victorygamers.org/uploads/1/3/1/4/131407945/ff188514fe098ed.pdfIn PDF document text
    • http://files.kaleenacarter.com/uploads/1/3/2/6/132695451/betan_sixobelavogo_zizipudarudogu.pdfIn PDF document text
    • http://files.stevebirdart.com/uploads/1/3/1/4/131406321/pewemafizusular_gobitu_tunemaz.pdfIn PDF document text
    • http://files.bestcarpetcleaningdavenport.com/uploads/1/3/2/6/132682723/xoxipot.pdfIn PDF document text
    • http://files.kneadedsolacemassage.com/uploads/1/3/0/7/130739826/6c215a4f7a.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/1/0428/7243/8947/files/wobakupopajas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2766/0951/files/perimeter_and_area_of_triangles_worksheets.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6372/9557/files/sobep.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2788/9319/files/battle_run_cheats.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7211/9193/files/java_http_get.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2936/4885/files/vubitiruzivukosabulofegil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5669/2390/files/estudios_atacameos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/5452/8677/files/kapezoxuxulolavekuwuwed.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3407/3505/files/96786821418.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0553/4620/files/reset_tcp_ip_stack.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1483/1780/files/wavowigudojasiso.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7141/3155/files/office_administrative_assistant_resume.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/2210/4222/files/xapajavijegogodajubawame.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9667 5160 bytes
SHA-256: 25f5476114ee47e49b35da405fb5746b0a6c70858eb0e1903d9b0052bf3a5e8b
font_01_sfnt_off0000a7db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA7DB 17168 bytes
SHA-256: ad592380d85971c4845c4d5fffa83a3abab21a6f93f7b9993a88ff27f521d308