Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec17c12551b4eb7e…

MALICIOUS

PDF

42.5 KB Created: 2020-08-30 13:50:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a5f0fface0de3e9f989f971bc8ddb60 SHA-1: 1317146195814d3e52beea25cba455f79729c6e4 SHA-256: ec17c12551b4eb7e86e939dd658427cbec4c35ab17756ad67320479f68ae825b
150 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, disguised as educational content. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM indicate that this PDF is part of a link farm designed to redirect users to malicious infrastructure. The embedded URL https://ttraff.ru/wix?keyword=ejercicios+de+los+sustantivos+para+imprimir is the primary indicator of malicious intent, likely leading to a phishing or malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/wix?keyword=ejercicios+de+los+sustantivos+para+imprimir
    • https://static.usrfiles.com/ugd/9dda13_eecc8527e81b4504aae2522b121eb57c.pdf
    • https://static.usrfiles.com/ugd/5d2cf3_cbb3248ed2344a528edbd859161d7713.pdf
    • https://static.usrfiles.com/ugd/5b5da7_848e2b6c6ae343c8a7f31f3b16e10fe2.pdf
    • https://cdn.shopify.com/s/files/1/0427/8213/0332/files/az_alkmaar_stadium_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/9000/9502/files/55884557467.pdf
    • https://cdn.shopify.com/s/files/1/0436/5362/8062/files/45255593638.pdf
    • https://cdn.shopify.com/s/files/1/0431/6626/9600/files/52719364694.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13170590630.pdf
    • https://cdn.shopify.com/s/files/1/0432/4796/0232/files/wapking._in_mp4_songs_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/6794/8706/files/winter_dreams_f_scott_fitzgerald.pdf
    • https://cdn.shopify.com/s/files/1/0431/4375/7985/files/jasoxejuvukogidame.pdf
    • https://cdn.shopify.com/s/files/1/0436/0096/9896/files/berliner_platz_3_neu_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/7543/6698/files/15448421857.pdf
    • https://cdn.shopify.com/s/files/1/0431/5106/5242/files/fiwigodijufi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065cd.bin
db70926c347863552898d9cc0a76a25c064bfde32d5ba667fd89affde8678ff8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65CD 5312 bytes
font_01_sfnt_off000077cd.bin
ee4c29eff05614e2f36cebe2116859c688138c72582f3bd5d91fede8e77e4548		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77CD 10944 bytes

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