Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffb306a51a2b1850…

MALICIOUS

PDF

39.0 KB Created: 2020-08-17 01:55:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5bd6cc9ad89b3b0c08b3432e19da9126 SHA-1: 0e39f0338fe68d34d9abda877cc97534e3482c41 SHA-256: ffb306a51a2b1850cdaa3d2a790c2f09ed83aac92a13aa21c29aba5ce27095c0
120 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including a redirector to a malicious domain, disguised as educational worksheets. The primary malicious link is https://ttraff.com/pify?keyword=following+written+directions+worksheets+for+middle+school, which likely leads to a further malicious resource. The document body is heavily obfuscated but contains references to the malicious URL and other PDF files hosted on Shopify. This indicates a link farm or redirection tactic to distribute malware.

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=following+written+directions+worksheets+for+middle+school
    • http://files.ramirezromerolab.com/uploads/1/3/0/7/130739043/dadasux.pdf
    • http://files.freedomgundogs.com/uploads/1/3/0/7/130775465/vajonogaxakubumo.pdf
    • https://cdn.shopify.com/s/files/1/0432/3803/1518/files/keborudufosovakasazilul.pdf
    • https://cdn.shopify.com/s/files/1/0433/0212/5733/files/84345371528.pdf
    • https://cdn.shopify.com/s/files/1/0435/0600/8216/files/12739676953.pdf
    • https://cdn.shopify.com/s/files/1/0449/4855/3887/files/medio_isotonico.pdf
    • https://cdn.shopify.com/s/files/1/0431/5211/3820/files/dafaziridadu.pdf
    • https://cdn.shopify.com/s/files/1/0433/5838/8374/files/nobigukuwetaj.pdf
    • https://cdn.shopify.com/s/files/1/0428/9495/0556/files/kudomep.pdf
    • https://cdn.shopify.com/s/files/1/0432/6142/7876/files/laxuxagivafejoferusaluno.pdf
    • https://cdn.shopify.com/s/files/1/0432/5857/7046/files/74131256410.pdf
    • https://cdn.shopify.com/s/files/1/0434/4437/1613/files/promissory_note_in_telugu_words.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_off00005930.bin
a6ec3996989e65a01477fdcec62bf3fac202417a8e94c2260cc57ae639673b56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5930 5336 bytes
font_01_sfnt_off00006b49.bin
3cc16c0e88ccbcdbc2bce3df60a75f4c11a377fc371ba8effd40b122b3405f76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B49 10404 bytes

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