Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dcfb6636c4591fc…

MALICIOUS

PDF

70.7 KB Created: 2020-08-31 01:13:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 70f3f12dc0d4c41ceedb69d825869775 SHA-1: ecda194571cc97da94a913baee1429caef62c615 SHA-256: 3dcfb6636c4591fc56d9e4ca2e349153c55d9be10c230831f032b43e1679064a
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with a critical heuristic identifying a link to a known malicious redirector at 'https://ttraff.com/wix?keyword=from+bauhaus+to+our+house+pdf'. This suggests a phishing or social engineering attack aimed at redirecting users to malicious content. The document body, though heavily obfuscated, contains references to the redirector URL and other URLs hosted on static.usrfiles.com, which are also present in the extracted URLs.

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/wix?keyword=from+bauhaus+to+our+house+pdf
    • http://www.douba
    • https://static.usrfiles.com/ugd/b8c837_a23d302d84f44745abc39ae295659b60.pdf
    • https://static.usrfiles.com/ugd/b8c837_b7acab406c2143de8b869b3fdc374bf4.pdf
    • https://static.usrfiles.com/ugd/cd79e3_141de82d5784445ea58fb9c148344dae.pdf
    • https://static.usrfiles.com/ugd/b8c837_b92030c7ddb24f22bdaf166238472d78.pdf
    • https://static.usrfiles.com/ugd/963627_cd880b7d046c44adac0299699d88d2e2.pdf
    • https://cdn.shopify.com/s/files/1/0433/9236/8796/files/templates_email_marketing_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0461/4180/0601/files/programming_arduino_uno_in_pure_c.pdf
    • https://cdn.shopify.com/s/files/1/0429/3938/3971/files/fluke_77_iii.pdf
    • https://cdn.shopify.com/s/files/1/0427/6033/9623/files/26993664843.pdf
    • https://cdn.shopify.com/s/files/1/0437/7129/7943/files/mcu_trivia_questions_and_answers.pdf
    • https://static.usrfiles.com/ugd/1f2646_2ae270f28c354c0699b849f1934ce5c1.pdf
    • https://static.usrfiles.com/ugd/b8c837_189295f9b67f465890b07b2c896eb7bb.pdf
    • https://static.usrfiles.com/ugd/89363e_d7e571be78e947c1a2e2b6853f1cdbed.pdf
    • https://static.usrfiles.com/ugd/5899d5_cc39be76860b488ebef7956beaeac775.pdf
    • https://static.usrfiles.com/ugd/ec0c41_11969c2b20044d35bf2e25419bb5ffd2.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/46905239833.pdf
    • https://cdn.shopify.com/s/files/1/0428/5258/1542/files/54742463580.pdf
    • https://cdn.shopify.com/s/files/1/0461/3842/5497/files/adding_and_subtracting_decimals_worksheets_6th_grade.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/49726552648.pdf
    • https://cdn.shopify.com/s/files/1/0430/2651/4077/files/zifuxojoxevapefefo.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_003_off00008ce8.bin
df6314e40f708e1b6ab1d004523d0d5687cb33de6b9f6bf583b4d872bbfcec15		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x8CE8 23188 bytes
font_01_sfnt_off0000d54e.bin
c6e77bdd37e0f66a23cba3eec1f19a4fb8546f55bf91a47f2cd5456974217f01		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD54E 5344 bytes
font_02_sfnt_off0000e754.bin
c33424ab19d0dbfec8a159fa495484558d0e2a4e72353105585daa994f596e6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE754 10368 bytes

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