Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d78e3d35c98c4f7…

MALICIOUS

PDF

77.8 KB Created: 2020-07-29 23:29:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 40e1a73e58f2746184ad3e9ecfe3893d SHA-1: 0b8853ac12bdcc50d47ff472d3e640ec61ec23e3 SHA-256: 1d78e3d35c98c4f7eff3dde5236e78f37f675c1cfc5c9bfe653784e81c99ae39
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external websites, indicating a link farm or redirection strategy. One critical heuristic identified a link to a known malicious redirector, ttraff.com, disguised as a biography of Pythagoras. The document body is heavily obfuscated, but the presence of the 'biografia de pitagoras pdf' string suggests a lure to attract users to click on the malicious links.

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/pify?keyword=biografia+de+pitagoras+pdf
    • http://files.hillmarfarm.com/uploads/1/3/1/8/131856186/5b5ee94.pdf
    • http://files.astephensscience.com/uploads/1/3/0/9/130969497/b0bbf0b7a6eeb.pdf
    • http://files.susanedwardsartwork.com/uploads/1/3/1/0/131069978/6351905.pdf
    • http://files.beneshieldfinancial.com/uploads/1/3/2/6/132681836/ecf8c.pdf
    • http://files.jeaniebarat.com/uploads/1/3/2/7/132740693/27af2654c147.pdf
    • https://cdn.shopify.com/s/files/1/0435/8068/6491/files/bupurelusukinujonewikonu.pdf
    • https://cdn.shopify.com/s/files/1/0429/5193/4108/files/gemupujaviditutopag.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/24810932871.pdf
    • https://cdn.shopify.com/s/files/1/0430/3552/5282/files/14570872142.pdf
    • https://cdn.shopify.com/s/files/1/0436/0945/6803/files/45006060777.pdf
    • https://cdn.shopify.com/s/files/1/0433/3358/2998/files/mukotovawojifojoj.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/92161478626.pdf
    • https://cdn.shopify.com/s/files/1/0436/1538/7811/files/bidizezibajilazudakix.pdf
    • https://cdn.shopify.com/s/files/1/0433/9603/8812/files/55219893798.pdf
    • https://cdn.shopify.com/s/files/1/0436/9619/3686/files/regomujalatukulade.pdf
    • https://cdn.shopify.com/s/files/1/0432/9255/7467/files/68236404057.pdf
    • https://cdn.shopify.com/s/files/1/0431/7400/2848/files/2509853118.pdf
    • https://cdn.shopify.com/s/files/1/0434/0957/1997/files/33108103078.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_off0000ed9a.bin
5cfe41eb8ac90758d4bdfe85ceb6becde037295ddfa1181496ccd5138a81b00d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED9A 4908 bytes
font_01_sfnt_off0000fe5e.bin
f82051da8ee8c093acde9050506fce3f21aa6f7ce64195985f39d6c1b583a8af		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5E 13336 bytes

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