Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3f16fd0123f19f8…

MALICIOUS

PDF

41.5 KB Created: 2020-08-29 03:39:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3f892bdc5a147443b5e5e90c2c52fe0b SHA-1: bcf5892492199cbcc121a51f6dd38ecaa429f54b SHA-256: c3f16fd0123f19f8021dec822c0bf5abcf2981143003328e686740155d70ebe0
120 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, a technique often used for SEO manipulation or to redirect users to malicious sites. One prominent URL, 'https://ttraff.com/wix?keyword=examen+th%25C3%25A9orique+niveau+2+plong%25C3%25A9e+2015', is flagged as a malicious redirector. The presence of numerous links to PDF files hosted on Shopify suggests a link farm intended to boost search engine visibility, a common tactic in SEO poisoning attacks. No scripts were extracted, and the document body is heavily obfuscated, but the link structure strongly indicates a malicious intent.

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.com/wix?keyword=examen+th%25C3%25A9orique+niveau+2+plong%25C3%25A9e+2015
    • https://cdn.shopify.com/s/files/1/0427/6987/5111/files/90461850612.pdf
    • https://cdn.shopify.com/s/files/1/0435/1351/2100/files/redoditolutuluxaj.pdf
    • https://cdn.shopify.com/s/files/1/0438/1668/1629/files/abiotic_and_biotic_factors_of_arctic.pdf
    • https://cdn.shopify.com/s/files/1/0434/0062/6341/files/79051361590.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mudamizoxudaxusuzo.pdf
    • https://cdn.shopify.com/s/files/1/0447/1390/2234/files/fidogabawixok.pdf
    • https://cdn.shopify.com/s/files/1/0431/1459/4464/files/boguviwunitasujalaja.pdf
    • https://static.usrfiles.com/ugd/b8c837_888f154a98fd4e1bafa54dac2af1c083.pdf
    • https://static.usrfiles.com/ugd/b8c837_c7c9de12e5e34ddb9f71395a7b25e11b.pdf
    • https://static.usrfiles.com/ugd/b8c837_e8ce41ed67484d7aac2e39a0f21bf604.pdf
    • https://static.usrfiles.com/ugd/b8c837_f45e0c67bf6d4144944e76151606cdb0.pdf
    • https://cdn.shopify.com/s/files/1/0440/6142/5814/files/9_crimes_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0430/7678/0192/files/zebumupobovidopogo.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_off00005e50.bin
bcc2692a7dd0011e26523db3354f5dcecb36a830e9a491a4b10ec7c1109c2b0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E50 5856 bytes
font_01_sfnt_off000071e9.bin
b2617764665e128cb524d51a58b1a9c8d684b78077df4fab5f1b6eac31a4de5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71E9 11488 bytes

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