Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9377a52bbfd58ef…

MALICIOUS

PDF

41.5 KB Created: 2020-08-30 20:33:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 691bcf1821ac9c0dc9a5fb8731e7b9e4 SHA-1: 776f25e9d0e4aa5a1e84613f03c30370d9e3a52b SHA-256: d9377a52bbfd58eff25d6ba6979c18408ebc38528f09a6ce88ec1f9e923d695d
120 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service. The primary malicious link, https://ttraff.cc/wix?keyword=trigonometria+exercicios+resolvidos+seno+cosseno+e+tangente+pdf, is flagged as malicious. The document body, though heavily obfuscated, also contains this URL, suggesting a lure to external content. The presence of a link farm heuristic further supports the malicious intent of redirecting users to potentially harmful sites.

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.cc/wix?keyword=trigonometria+exercicios+resolvidos+seno+cosseno+e+tangente+pdf
    • https://cdn.shopify.com/s/files/1/0429/3342/0195/files/upsc_electrical_engineering_question_papers_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/9265/5782/files/uc_browser_untuk_android_2._2.pdf
    • https://cdn.shopify.com/s/files/1/0431/7102/0957/files/wusatomo.pdf
    • https://cdn.shopify.com/s/files/1/0434/6842/3330/files/jujonutatavadurul.pdf
    • https://cdn.shopify.com/s/files/1/0434/5298/9605/files/danulikifakegapanomo.pdf
    • https://static.usrfiles.com/ugd/5af86b_4a6d6f95cb264819b2a3459215a94d14.pdf
    • https://static.usrfiles.com/ugd/07e02c_58ca3f247b494770886c5a3dc56aaa2c.pdf
    • https://static.usrfiles.com/ugd/724bd4_1593af5690a543e89bfcb0603e8c6ec0.pdf
    • https://cdn.shopify.com/s/files/1/0431/7547/7416/files/kiwamadusajufujizamedope.pdf
    • https://cdn.shopify.com/s/files/1/0440/9825/7048/files/irish_bouzouki_chord_bible.pdf
    • https://static.usrfiles.com/ugd/eb5a6a_9c2bc6e14f0948a6b510c9f518a68b54.pdf
    • https://static.usrfiles.com/ugd/b8c837_c158ba2cfbc04189b35daf60ae48f1cc.pdf
    • https://static.usrfiles.com/ugd/9b7d8a_b6568cf7843b4252af789a57251bca81.pdf
    • https://static.usrfiles.com/ugd/12f4eb_0d4a941b37dd4ba1b660304b1c912ad7.pdf
    • https://static.usrfiles.com/ugd/b8c837_0ee06d60f0284a798a6b926a51b6b185.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_off00006335.bin
f8e55d3cca5361c5fdfffef630cabd595434925066eb60141e41e89bdcc065c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6335 5552 bytes
font_01_sfnt_off00007604.bin
c44da9064e7095b9b1504334969c33a827bb977daf08f4b1a9ae95496f38b6b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7604 10288 bytes

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