Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0aef658c0a2d4a5…

MALICIOUS

PDF

45.4 KB Created: 2020-09-04 06:13:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9f0f93b5f38d08aa1153d0ea305e210 SHA-1: b8eee40305735bd766f3c3dd40ca12efb923b21d SHA-256: a0aef658c0a2d4a57dd261afe78c93e0c5f6fde7679b89c48feca9cb5514877d
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.me/wix?keyword=bluestacks+1+2016'. This indicates the document's primary purpose is to redirect users to a potentially harmful external resource. The presence of numerous other links, flagged as a PDF link farm, further supports this malicious intent. 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=bluestacks+1+2016
    • https://static.usrfiles.com/ugd/7c30af_31b5006a76fd4d64bb5501613e097a38.pdf
    • https://static.usrfiles.com/ugd/82e28d_5df36ea878be46aeac20d2f01b2e48e3.pdf
    • https://static.usrfiles.com/ugd/b8c837_41e7b55853824b1d8aa276587fab3c5e.pdf
    • https://static.usrfiles.com/ugd/29c71c_77a185f0d760477d9cb8fab8fd037156.pdf
    • https://cdn.shopify.com/s/files/1/0427/4244/8295/files/47968526025.pdf
    • https://cdn.shopify.com/s/files/1/0435/0096/1947/files/projeto_alimentao_saudvel_educao_infantil.pdf
    • https://cdn.shopify.com/s/files/1/0439/0027/2792/files/zepufemebizumaduxedu.pdf
    • https://cdn.shopify.com/s/files/1/0439/1862/2875/files/20090794858.pdf
    • https://static.usrfiles.com/ugd/4bdc6d_0f820055723f49359bfd00cf7bf484e0.pdf
    • https://static.usrfiles.com/ugd/5dc3ca_2860d41324c64664913f55933d9af889.pdf
    • https://static.usrfiles.com/ugd/405339_fdc074ccaf5f4254b64d8f717d3176a0.pdf
    • https://static.usrfiles.com/ugd/b8c837_e7e32b66f6294d6b98eaf0221bf5f332.pdf
    • https://static.usrfiles.com/ugd/ef253e_3f115c0e1f0647b6b5b62a90b664edfe.pdf
    • https://cdn.shopify.com/s/files/1/0440/4389/4934/files/buzipefojutixavikelume.pdf
    • https://cdn.shopify.com/s/files/1/0432/1506/1153/files/zojulizujurusewujikazunet.pdf
    • https://cdn.shopify.com/s/files/1/0431/4647/7722/files/61548796686.pdf
    • https://cdn.shopify.com/s/files/1/0463/5987/1643/files/blood_placental_barrier.pdf
    • https://cdn.shopify.com/s/files/1/0438/1832/0034/files/wopirebugudekovuribiz.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_off0000730a.bin
68af6763c518471a242283f407967c594c2f9474b3874f76bace4349491adc7c
pdf-font-stream PDF embedded font (sfnt) at offset 0x730A 5288 bytes
font_01_sfnt_off00008522.bin
ad3746045eccc6a52cbc45677d3a084a84c64a708b93d59e49fc5356bf409853
pdf-font-stream PDF embedded font (sfnt) at offset 0x8522 10932 bytes