Malicious PDF — malware analysis report

Static analysis result for SHA-256 91ad82ccc43e42a6…

MALICIOUS

PDF

54.8 KB Created: 2020-08-31 21:08:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 72db7998fe9e582cdc20ff4a4763bea5 SHA-1: 9b6187ae6d0a3e78d7cbd4b740aa62f5f8ec0ca2 SHA-256: 91ad82ccc43e42a609f7d0a88920ef14449d780c4e445e4b4351d29cc8c54451
120 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/wix?keyword=chloroform+meaning+in+kannada'. This URL is embedded within the document's body and is also listed as a primary IOC. The PDF also exhibits characteristics of a link farm, with numerous external links, suggesting an attempt to drive traffic to potentially malicious sites. The document body itself is heavily obfuscated but contains the target URL.

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.cc/wix?keyword=chloroform+meaning+in+kannada
    • https://static.usrfiles.com/ugd/9c43ec_457a8e9c24be4e749240545c1a592992.pdf
    • https://static.usrfiles.com/ugd/b8c837_78053507305a4319bb910a4fe9f57aff.pdf
    • https://static.usrfiles.com/ugd/b8c837_f98fac90fa214322abfe941517a167fb.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/baxijis.pdf
    • https://cdn.shopify.com/s/files/1/0439/5070/2750/files/53372087089.pdf
    • https://cdn.shopify.com/s/files/1/0428/3842/5767/files/73601155224.pdf
    • https://cdn.shopify.com/s/files/1/0434/0016/7589/files/calendar_2020_malaysia.pdf
    • https://cdn.shopify.com/s/files/1/0434/9476/8802/files/bollywood_movies_2018_free.pdf
    • https://static.usrfiles.com/ugd/b8c837_082fc1adabb645738f6f2742f0988522.pdf
    • https://static.usrfiles.com/ugd/930050_20ccc08f574f498b80c0b9c9603b128e.pdf
    • https://static.usrfiles.com/ugd/38bf1f_b86e2b9d6e4142e28bd70de439f8edb5.pdf
    • https://static.usrfiles.com/ugd/45e30f_eb98906367504fdaac55fbbc1b41e561.pdf
    • https://static.usrfiles.com/ugd/dba42a_ee916a60fc844ea89a2813556c03a5a7.pdf
    • https://static.usrfiles.com/ugd/12dc78_1304e6fcd761478da6cd20f600af2868.pdf
    • https://static.usrfiles.com/ugd/2f3ac6_5be0a6e8db204de3a4aaeb064e73973a.pdf
    • https://static.usrfiles.com/ugd/b8c837_28a77f0aaf4a42bf9f922650f7f0fd43.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00007690.bin
ee47e1e0f67f781ab5a94589196b32e02c1157889595e495b1da2658bb927041		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x7690 16876 bytes
font_00_sfnt_off00005138.bin
3a61577026d4ab24299eef6735d0d7ba4c96d4f1d13b268505ec10b87a9344d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5138 5112 bytes
font_01_sfnt_off00006265.bin
7a35ad34c7898ceae7e789208b92259103a60798f20b7c8cd4c5b8ffc21b2fff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6265 6308 bytes
font_03_sfnt_off00009cbc.bin
de5e46cc476ea1ff63d18434674bd069d68176ca56460eaa20a5e6425e8012da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CBC 9688 bytes
font_04_sfnt_off0000bdb9.bin
ecff27cca69479a7e7c0920ca1515bb9627b472742c0a89b358e38306d6063a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBDB9 3212 bytes

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