Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0d52e03583a674d…

MALICIOUS

PDF

63.4 KB Created: 2020-08-30 12:08:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7d77eb3d4865a1c6693764ba2fc6878 SHA-1: 47f51c89bc68858bbddaf67a430b3e0475017c7b SHA-256: a0d52e03583a674dc28d2ec59a2022f665249c37e4a25b0f208197322cfc666d
150 Risk Score

Malware Insights

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

The PDF was flagged as malicious by an ML classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. It also exhibits characteristics of a link farm, with numerous external links. The primary malicious IOC is the ttraff.ru URL, which is used in conjunction with a keyword that appears to be a lure.

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=lesson+78+using+semicolons+and+colons+answers
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/54686169254.pdf
    • https://cdn.shopify.com/s/files/1/0443/2792/7964/files/atul_kochhar_books.pdf
    • https://cdn.shopify.com/s/files/1/0435/8569/9997/files/latest_development_in_science_and_technology.pdf
    • https://cdn.shopify.com/s/files/1/0434/2480/9116/files/holman_kjv_study_bible_download.pdf
    • https://static.usrfiles.com/ugd/b8c837_ec86922705b3465d918955a86c9d42d7.pdf
    • https://static.usrfiles.com/ugd/4b874d_ea230e61d869439f8b210312fa3bf11c.pdf
    • https://static.usrfiles.com/ugd/b8c837_c79df8530f58410ab29620deeff8cf9f.pdf
    • https://static.usrfiles.com/ugd/599026_dbdc6cfb3ad74278afe548c8e9b43c0a.pdf
    • https://cdn.shopify.com/s/files/1/0435/9772/5864/files/sesowafeximo.pdf
    • https://cdn.shopify.com/s/files/1/0434/4777/9478/files/surjective_function_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rerotapok.pdf
    • https://cdn.shopify.com/s/files/1/0432/5936/3488/files/nomarasubirisobimizebu.pdf
    • https://cdn.shopify.com/s/files/1/0438/1786/1277/files/54635435240.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_off0000abbf.bin
f95987161516486032fc6058a7a4b40bbaf4b29baa2769b5470d4e263deb7ea0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xABBF 5564 bytes
font_01_sfnt_off0000bea1.bin
b5107f5998e8408e89025aeafb75b5e57a32133c612e5d2e5a424bb95b37ef60		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBEA1 16072 bytes

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