Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a5b2dc18aaed71f…

MALICIOUS

PDF

32.9 KB Created: 2020-08-05 03:14:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bfe8a7be4958717a25c81053e738f06c SHA-1: a900b4860041670b718c9de7c801d222289c5543 SHA-256: 1a5b2dc18aaed71ff552446bb67ccedb6d474df1e27e88d74b756eb4470ff691
150 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many of which are hosted on Shopify and appear to be SEO-optimized book downloads. One critical heuristic indicates a malicious redirector link, specifically 'https://ttraff.com/pify?keyword=cambridge+english+for+engineering+download+pdf', which is the primary indicator of malicious intent. The document body text and embedded URLs reinforce the lure of downloading a PDF, likely to trick users into visiting the malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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=cambridge+english+for+engineering+download+pdf
    • http://files.horseshelpingpeople.net/uploads/1/3/0/8/130874067/vobovusavumikepo.pdf
    • http://files.atriumcorporatepark.com/uploads/1/3/0/7/130776743/xixufo-xojatowarepuvo-lozikimasu.pdf
    • http://files.adamjchong.com/uploads/1/3/1/4/131407921/ribudeko.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/49090326843.pdf
    • https://cdn.shopify.com/s/files/1/0439/5070/2750/files/les_thanatonautes.pdf
    • https://cdn.shopify.com/s/files/1/0433/4485/5195/files/88157133997.pdf
    • https://cdn.shopify.com/s/files/1/0431/7983/5547/files/66312941630.pdf
    • https://cdn.shopify.com/s/files/1/0440/6178/6262/files/a_survey_of_modern_algebra_by_birkhoff_and_maclane.pdf
    • https://cdn.shopify.com/s/files/1/0431/7757/4551/files/bafujatuwulejojupagav.pdf
    • https://cdn.shopify.com/s/files/1/0433/7431/3621/files/certification_of_trust.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wadilizesiwegokadokepub.pdf
    • https://cdn.shopify.com/s/files/1/0430/5793/8581/files/kafimiwepilarija.pdf
    • https://cdn.shopify.com/s/files/1/0428/6559/0438/files/tunidereguteponuvawava.pdf
    • https://cdn.shopify.com/s/files/1/0435/1728/0408/files/40958777348.pdf
    • https://cdn.shopify.com/s/files/1/0437/7152/7325/files/pajibopabome.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_off0000444c.bin
bb01578279f85392eff65e0e93b4f633fdb5d69cd9c7556c64ef04ffe962d00f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x444C 5592 bytes
font_01_sfnt_off0000572b.bin
e7284f7f36deb10ec9becd2855c513598ce6bc3b686a26cfd453ca52e856b50c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x572B 9188 bytes

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