Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3f3e4bc27a27703…

MALICIOUS

PDF

34.2 KB Created: 2020-08-31 09:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ff85c103cfad71717040f9d5e3d5c317 SHA-1: e94b729ece423040dc2f69c7379dfdd98f47a2c0 SHA-256: b3f3e4bc27a27703ef5b0cf6bf3f7bef4bd6ed9447d84ff4be484d8cab9323fb
120 Risk Score

Malware Insights

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

The PDF file contains a mass external link farm, with one URL identified as a malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a test or worksheet title, along with the malicious URL. This suggests a social engineering attempt to direct users to malicious infrastructure.

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=test+de+ansiedad+de+hamilton+descarg
    • https://static.usrfiles.com/ugd/4cf28d_1d45822bb57f4e0db0d5ace9a7fee5c6.pdf
    • https://static.usrfiles.com/ugd/3ceeb9_31317c19c7bd4bd390bd74c23a3e47e6.pdf
    • https://static.usrfiles.com/ugd/9b5f63_33625ceb2ea844778be03c8cbd7dbd7b.pdf
    • https://static.usrfiles.com/ugd/b8c837_daf709f4c772486cbde61e62e75b0001.pdf
    • https://cdn.shopify.com/s/files/1/0431/3448/4648/files/9940172071.pdf
    • https://cdn.shopify.com/s/files/1/0430/0803/2922/files/understanding_human_sexuality_hyde_p.pdf
    • https://cdn.shopify.com/s/files/1/0431/2521/1298/files/fojujudotironevoximu.pdf
    • https://cdn.shopify.com/s/files/1/0429/0913/9111/files/logos_pathos_ethos_kairos_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0447/9696/9121/files/assertion_and_reason_questions_for_aiims.pdf
    • https://cdn.shopify.com/s/files/1/0431/6043/6896/files/chernobyl_disaster_summary.pdf
    • https://cdn.shopify.com/s/files/1/0448/5152/7842/files/vlc_command_line.pdf
    • https://static.usrfiles.com/ugd/b8c837_a4a378839d60410eb8dbaa4adbe5138b.pdf
    • https://static.usrfiles.com/ugd/cafc24_89513894dde84270bc4156d13bb81c30.pdf
    • https://static.usrfiles.com/ugd/b8c837_d555d847c9024a99bd9a694c86e40bf4.pdf
    • https://static.usrfiles.com/ugd/b4f0c6_36ae6b03b9994129ad719817d0a941cf.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_off0000498e.bin
12bef7fe091838c33f8653d52e2488af814a4f2d2a8c613b7938fff0e9282852		 pdf-font-stream PDF embedded font (sfnt) at offset 0x498E 5300 bytes
font_01_sfnt_off00005b5e.bin
c9a7dcffd2b0844812f899665bdbfd5ab44931c3e819ef2c80614652b0f84197		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B5E 9540 bytes

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