Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a3e35fd3ec0212e…

MALICIOUS

PDF

53.5 KB Created: 2020-08-06 20:48:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b59c89f90561d1815d0e9a5d79b06e2b SHA-1: e4e991efbfeb0e6fdf323f66dd9692b4467e7b74 SHA-256: 3a3e35fd3ec0212e10bc197284b1e29ae51d6a500d0d74d22005bf045b0d4400
150 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with multiple links pointing to Shopify-hosted PDFs. One of these links, https://ttraff.ru/pify?keyword=esl+beginner+conversation+pdf, is identified as a malicious redirector. The document body, though heavily obfuscated, contains the same URL, suggesting the primary intent is to redirect users to malicious infrastructure via a seemingly benign lure.

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.ru/pify?keyword=esl+beginner+conversation+pdf
    • http://files.punkberrythailand.com/uploads/1/3/1/8/131856122/b260232.pdf
    • http://files.salemtennisandswimclub.com/uploads/1/3/1/6/131636903/b55c01b30.pdf
    • http://files.ayishamoss.com/uploads/1/3/2/7/132712003/4406568.pdf
    • http://genotaz.dena-robertson.com/uploads/1/3/1/1/131163599/870773.pdf
    • http://files.kylesteffensmotorsports.com/uploads/1/3/0/8/130873758/3383838.pdf
    • https://cdn.shopify.com/s/files/1/0436/9917/5579/files/zuwulome.pdf
    • https://cdn.shopify.com/s/files/1/0429/5429/3402/files/19119121684.pdf
    • https://cdn.shopify.com/s/files/1/0430/7674/7413/files/appareillage_schneider_odace.pdf
    • https://cdn.shopify.com/s/files/1/0436/5120/3225/files/49707721452.pdf
    • https://cdn.shopify.com/s/files/1/0431/6784/2465/files/kovavok.pdf
    • https://cdn.shopify.com/s/files/1/0437/4659/0872/files/celestine_the_living_saint.pdf
    • https://cdn.shopify.com/s/files/1/0431/5725/8395/files/26956264949.pdf
    • https://cdn.shopify.com/s/files/1/0430/8199/0295/files/bagomorinipodaxe.pdf
    • https://cdn.shopify.com/s/files/1/0431/6810/4610/files/vubezilusazaxejozisib.pdf
    • https://cdn.shopify.com/s/files/1/0430/9286/9281/files/66374360261.pdf
    • https://cdn.shopify.com/s/files/1/0430/0881/9349/files/64190591279.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_off000092f1.bin
f42c5020a29bd68e5432520d4bfb947d641e835d3924d315873138b1f610692a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92F1 5480 bytes
font_01_sfnt_off0000a5ad.bin
e6c2e050735cc96aa4a7bcd4c1b740bca6194d32a8050823559de857fc42ba1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA5AD 10428 bytes

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