Malicious PDF — malware analysis report

Static analysis result for SHA-256 9af98b1609aff8a0…

MALICIOUS

PDF

41.8 KB Created: 2020-08-12 02:13:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 635d48ff78d05055e702867d23188fcb SHA-1: d89b977feb98137b58f21a3ceabfebd4c72d2619 SHA-256: 9af98b1609aff8a07e1b564d7f666fa2c0c795b434e1afcee020cf2afea23a91
120 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating a link to known malicious redirector infrastructure. The document body and embedded links suggest a lure for free PDF downloads, specifically mentioning 'Curso de espanhol para iniciantes pdf'. The primary malicious IOC is the redirector URL, which likely leads to further malicious content or exploits.

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/pify?keyword=curso+de+espanhol+para+iniciantes+pdf
    • http://files.illuminolightingco.com/uploads/1/3/2/6/132683165/xawijakufuvofikara.pdf
    • http://files.leslienagel.com/uploads/1/3/1/4/131437012/dukavagexovuj-fofofux-moneziw-vikefad.pdf
    • http://nuxizabu.mightyfortressinspections.com/uploads/1/3/0/8/130813108/f40b4a08c89c9.pdf
    • https://cdn.shopify.com/s/files/1/0434/2261/3669/files/xukupenipazat.pdf
    • https://cdn.shopify.com/s/files/1/0429/2096/8351/files/pamomeputufarifapunadidan.pdf
    • https://cdn.shopify.com/s/files/1/0430/4017/8333/files/create_new_branch_github.pdf
    • https://cdn.shopify.com/s/files/1/0436/1859/9075/files/cfop_method_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0433/6415/5560/files/algebra_ebook_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0449/4072/2331/files/anthropogenic_pollution.pdf
    • https://cdn.shopify.com/s/files/1/0437/8922/2045/files/gobupisizara.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dobemajafapurotexujebo.pdf
    • https://cdn.shopify.com/s/files/1/0435/3887/4532/files/eye_text_symbol.pdf
    • https://cdn.shopify.com/s/files/1/0428/9229/6359/files/gufunokutitaniwipu.pdf
    • https://cdn.shopify.com/s/files/1/0437/3282/8314/files/dwarf_fortress_melt.pdf
    • https://cdn.shopify.com/s/files/1/0443/3369/5132/files/add_watermark_to_foxit_reader.pdf
    • https://cdn.shopify.com/s/files/1/0438/9309/6600/files/tozizuligufizadigaxesap.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_off00006164.bin
1ee976b4b8276e730899e34cbaf06048d9ad0bc75e80f9958cdccfce728ff444		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6164 5148 bytes
font_01_sfnt_off000072d6.bin
a6aa80098e2fd00f4777f3103ba32a3599792023154050ac435a722dc7756528		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72D6 12616 bytes

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