Malicious PDF — malware analysis report

Static analysis result for SHA-256 90574aa38b319df8…

MALICIOUS

PDF

43.9 KB Created: 2020-08-30 16:17:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 40f4e67a501b02e0424c2667ccd9ec04 SHA-1: 56408804f7d3332dbbeab711ecd02f2dee9ad7c4 SHA-256: 90574aa38b319df8f2fc4419204930740b3e4277050c78d418fa3b1b17536492
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.com/wix?keyword=exercicios+de+porcentagem+com+gabarito+5o+an'. This indicates an attempt to lure users to a malicious site. The document also contains a large number of embedded links, identified as a PDF link farm, further supporting the malicious intent. The document body, though heavily corrupted, contains fragments of the URL, suggesting it was intended to be presented to the user.

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=exercicios+de+porcentagem+com+gabarito+5o+ano
    • https://static.usrfiles.com/ugd/19ce5d_010795e1e23b4aa49bf091066ee0971a.pdf
    • https://static.usrfiles.com/ugd/b8c837_bf36f6b73d654dffb9ad9e1c2509dd58.pdf
    • https://static.usrfiles.com/ugd/10e3af_1c43e0ab543345738fe0296064803d50.pdf
    • https://static.usrfiles.com/ugd/e42ee3_d962dc77defb44d6bbc16bb7fb89eff3.pdf
    • https://static.usrfiles.com/ugd/ab0441_0c054662147c4c0e906746ac9d9d5185.pdf
    • https://cdn.shopify.com/s/files/1/0432/5706/9736/files/little_rock_catholic_study_bible.pdf
    • https://cdn.shopify.com/s/files/1/0431/0230/6468/files/the_astronaut_s_wife_movie.pdf
    • https://cdn.shopify.com/s/files/1/0434/2769/2695/files/49600510623.pdf
    • https://cdn.shopify.com/s/files/1/0434/5469/3537/files/virafanabavadorujivotejok.pdf
    • https://static.usrfiles.com/ugd/65b209_27fa59e9cd0745dd93e075dbed2ab693.pdf
    • https://static.usrfiles.com/ugd/b8c837_16064dedc23c41148a2f399905ceec76.pdf
    • https://static.usrfiles.com/ugd/80c1db_a4703f3d2fe847c681e1d963b34f64c6.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_off000065b8.bin
4869c87c2695f88f08b4f60310f1eba7b85b1b4a3fab932ae1796e97d1736db1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65B8 5648 bytes
font_01_sfnt_off000078d7.bin
4a0a5140ee9b851e5cb77622b59ccec7a807259eaf929b167fa57c28fe7d4bd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78D7 13308 bytes

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