Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7b158392e54f682…

MALICIOUS

PDF

86.6 KB Created: 2020-08-30 13:22:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b6e7e25e518703a5652d2241fe83ea2e SHA-1: 9b77b6e84027ccab2d6410464e568f5a1a3c8ae8 SHA-256: d7b158392e54f6825e106e2e00cd40ad7073a49837ba44fe7ec77039cb7fd9d8
150 Risk Score

Malware Insights

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

The PDF document was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The primary malicious URL identified is https://ttraff.ru/wix?keyword=%25E0%25B8%25A7%25E0%25B8%25B4%25E0%25B8%2598%25E0%25B8%25B5%25E0%25B9%2583%25E0%25B8%258A%25E0%25B9%2589+bootstrap+%25E0%25B9%2583%25E0%25B8%2599%25E0%25B9%2581%25E0%25B8%259A%25E0%25B8%259A+html, which is part of a known malicious redirector infrastructure. The document body, though heavily obfuscated, also contains this URL and numerous other links hosted on static.usrfiles.com, suggesting a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.ru/wix?keyword=%25E0%25B8%25A7%25E0%25B8%25B4%25E0%25B8%2598%25E0%25B8%25B5%25E0%25B9%2583%25E0%25B8%258A%25E0%25B9%2589+bootstrap+%25E0%25B9%2583%25E0%25B8%2599%25E0%25B9%2581%25E0%25B8%259A%25E0%25B8%259A+html
    • https://static.usrfiles.com/ugd/b8c837_8c683f470e8d4d2c9afb00afbd6570fe.pdf
    • https://static.usrfiles.com/ugd/eed56f_1f40c558d42d406b85f81a23fff50cf0.pdf
    • https://static.usrfiles.com/ugd/0c41e7_52b89fa631df4e4e82126838737a4cfc.pdf
    • https://static.usrfiles.com/ugd/b8c837_60aaee2e208e4dbaaa5c02bb66bc77a7.pdf
    • https://static.usrfiles.com/ugd/49be48_d1daa124868f4173939fbf5a71f431d1.pdf
    • https://static.usrfiles.com/ugd/57c819_fba3fd612fd6488790342108c2914dc6.pdf
    • https://static.usrfiles.com/ugd/c068f8_253cc2e5b5c04541b990f527c17c8663.pdf
    • https://cdn.shopify.com/s/files/1/0429/6255/0940/files/balanced_scorecard_strategy_for_dummies.pdf
    • https://cdn.shopify.com/s/files/1/0432/0860/5859/files/patukozasolawarunaje.pdf
    • https://cdn.shopify.com/s/files/1/0439/4532/8808/files/alta_complejidad_osep.pdf
    • https://cdn.shopify.com/s/files/1/0433/2113/1161/files/ferubozi.pdf
    • https://static.usrfiles.com/ugd/822ecd_3c9a4ea9c95d41e19a25118882aa9803.pdf
    • https://static.usrfiles.com/ugd/b8c837_38dddddc7c7e49d583fa979dad88aae9.pdf
    • https://static.usrfiles.com/ugd/b8c837_4a65437d74f04c28a5d146b6fab35e5d.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_off0000d555.bin
002582ac2f122417329eba62137cc067bc218df4fcea368b1114d39113e6435b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xD555 16876 bytes
font_00_sfnt_off0000b024.bin
ae4ebd223c138e44398a9bbd5fe8f720de266c5d16157fceada3a548bc50194f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB024 5104 bytes
font_01_sfnt_off0000c141.bin
26f4ddde201d64afa3b6d4f298e3229ffb3fbefb3c8e28745103f00ff7a9bdb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC141 7600 bytes
font_03_sfnt_off000102d9.bin
ce44df636815ace68f3fd16f35b7fef002be79a1b3ddcf1ffc4bddd2e2583294		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102D9 15672 bytes
font_04_sfnt_off000133de.bin
e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x133DE 16204 bytes

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