Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9791bfb96097d74…

MALICIOUS

PDF

39.9 KB Created: 2020-08-13 19:24:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 47e9fe88aace034237348d169f7689a6 SHA-1: 30a86c98033e537c95daadae80bdc8f7ab49065a SHA-256: f9791bfb96097d74a896c41fcf4e1fb84f83026a8a5259fa0f52bd813345fe65
120 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many of which point to external PDF files hosted on various domains, suggesting a link farm for SEO manipulation. One critical heuristic identified a direct link to a known malicious redirector, ttraff.cc, which is likely the primary malicious payload delivery mechanism. The document body, though heavily obfuscated, contains the text 'Comparing and ordering numbers 2nd grade worksheets' and the malicious URL, indicating a lure to disguise the 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.cc/wb?keyword=comparing%20and%20ordering%20numbers%202nd%20grade%20worksheets
    • http://files.lagom-online.com/uploads/1/3/0/7/130775191/tobaxowex-rufofevux-tabovesilimi.pdf
    • http://files.roybrash.com/uploads/1/3/1/3/131379042/foviw_sijovevoziv_jebirege_rifixenofe.pdf
    • http://files.sunnybottom.com/uploads/1/3/0/7/130740530/jiwawivi.pdf
    • http://files.blacksheeprugby.com/uploads/1/3/1/4/131405977/6828369.pdf
    • https://cdn.shopify.com/s/files/1/0454/6861/4808/files/nergies_renouvelables_avantages_et_inconvnients.pdf
    • https://cdn.shopify.com/s/files/1/0434/3015/0300/files/pudusafus.pdf
    • https://cdn.shopify.com/s/files/1/0433/1415/1589/files/totilifomojajuwixosifumi.pdf
    • https://cdn.shopify.com/s/files/1/0428/8600/4899/files/43021682228.pdf
    • https://cdn.shopify.com/s/files/1/0433/9869/3013/files/zeros_of_polynomial_functions_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0430/6026/5117/files/ponutunesulebozewaf.pdf
    • https://cdn.shopify.com/s/files/1/0430/5689/0013/files/72288822280.pdf
    • https://cdn.shopify.com/s/files/1/0431/5014/7745/files/equidistant_projection.pdf
    • https://cdn.shopify.com/s/files/1/0430/8844/5604/files/refavojorobegogewuxutum.pdf
    • https://cdn.shopify.com/s/files/1/0427/7737/8972/files/51506051219.pdf
    • https://cdn.shopify.com/s/files/1/0433/5609/4614/files/45744025587.pdf
    • https://cdn.shopify.com/s/files/1/0428/4504/4892/files/piwoguwibupuvibepaxe.pdf
    • https://cdn.shopify.com/s/files/1/0435/5332/5215/files/bawozomofoni.pdf
    • https://cdn.shopify.com/s/files/1/0437/8551/9255/files/39032609219.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_off00005b51.bin
e0df02a2145924da242b24add3f3fb7861c023aa927d5b7a1cec0606fbb5d9db
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B51 5672 bytes
font_01_sfnt_off00006e78.bin
e1473dedc5efe74553d9ae094e9c6a8e86231d250af4f2cc9ed36d93d39d74b0
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E78 10524 bytes