Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b763c953ec5cb81…

MALICIOUS

PDF

67.4 KB Created: 2020-09-04 07:24:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 96e95834bb2c21f2e1acc2b13e28cdb8 SHA-1: 23aa9bb8c12f5470877371de701fa99ab7505656 SHA-256: 8b763c953ec5cb819e85deb437c346e0f6bf6faa655da73e8b7982adf1fc5139
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.me/wix?keyword=surat+al+waqiah+arab+saja'. This indicates the document's primary purpose is to lure the user to a potentially harmful external site. The presence of a large number of embedded PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute the malicious redirector. The ML classifier also strongly flagged this PDF as malicious.

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.me/wix?keyword=surat+al+waqiah+arab+saja
    • https://cdn.shopify.com/s/files/1/0428/4016/2467/files/95225534352.pdf
    • https://cdn.shopify.com/s/files/1/0461/5274/5123/files/oxford_bookworms_ebook_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/4856/6933/files/moxudupiwodipawa.pdf
    • https://cdn.shopify.com/s/files/1/0429/4492/1766/files/hitman_2016_trophy_guide.pdf
    • https://static.usrfiles.com/ugd/d01287_aa54aca122eb4f30bb9a39f65b08a009.pdf
    • https://static.usrfiles.com/ugd/ce77c6_821c90827fe74cdd981804b044fc4c0e.pdf
    • https://static.usrfiles.com/ugd/b8c837_96192b8ab6bf4784b6c7c8c9a3af1dd8.pdf
    • https://static.usrfiles.com/ugd/0d089b_1d5766a122ff4865b6460625af84ef71.pdf
    • https://static.usrfiles.com/ugd/cec570_ea4b02ed8af04208b86deb79d2b90577.pdf
    • https://static.usrfiles.com/ugd/cb5dea_ceb64aa17b3a47e8ac56a7b60881febe.pdf
    • https://cdn.shopify.com/s/files/1/0430/1268/5977/files/73750588523.pdf
    • https://cdn.shopify.com/s/files/1/0435/4116/8283/files/54525292280.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000c905.bin
3f82af8d4c7c66ea2bc905ce7ee3d71caa13592a1e8708abd95ce5639a38da0b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xC905 30220 bytes
font_00_sfnt_off0000919f.bin
157bff790af3916fdd2547c87a950c71156cb16ba99df7052565794e7a08f2c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x919F 5308 bytes
font_01_sfnt_off0000a3b3.bin
1b2238115b652ba14cad4ad1d2488014c653d90e0ab8b91d3b6292de3db96801		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA3B3 12652 bytes

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