Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a47d5e5382646a5…

MALICIOUS

PDF

67.4 KB Created: 2020-09-01 09:42:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 899c83e5b9d1f3c1e4ccf2b17d3099cc SHA-1: 9c4946b36f2525b7e0dd0bd8bfa576ebfb9aabc3 SHA-256: 3a47d5e5382646a5cd5f99c8b36a3ad1aec51796f48992e9cbf97dc831ea5549
120 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to a redirector service. The primary malicious URL identified is https://ttraff.cc/wix?keyword=parallel+circuit+calculations+worksheet, which is likely used to direct users to a malicious site. The document body, though heavily obfuscated, contains this URL, suggesting it's the intended destination. The presence of numerous PDF links indicates a link farm strategy, likely for SEO poisoning or to obscure the final malicious destination.

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=parallel+circuit+calculations+worksheet
    • https://cdn.shopify.com/s/files/1/0437/9174/5185/files/kumigesamobinufunixarix.pdf
    • https://cdn.shopify.com/s/files/1/0438/6249/1286/files/vlc_video_player_for_android_tv.pdf
    • https://cdn.shopify.com/s/files/1/0430/7720/6178/files/libros_sobre_aprendizaje_cooperativo.pdf
    • https://cdn.shopify.com/s/files/1/0437/2096/6293/files/25058650225.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/61053474184.pdf
    • https://cdn.shopify.com/s/files/1/0434/4938/5126/files/connotation_and_denotation_lesson_plan.pdf
    • https://cdn.shopify.com/s/files/1/0437/6517/0334/files/nothing_was_the_same_download_sharebeast.pdf
    • https://cdn.shopify.com/s/files/1/0435/2661/9288/files/java_default_value.pdf
    • https://static.usrfiles.com/ugd/73c254_80842e6c044345498c66d4ceb1ae9963.pdf
    • https://static.usrfiles.com/ugd/078c79_e5a6938c5ebf4c9bae6542d5570aa642.pdf
    • https://static.usrfiles.com/ugd/271e65_453f451ebe9d416984e59a2a8192462a.pdf
    • https://static.usrfiles.com/ugd/0ad6c7_ac4cd52dbe7a4e91930cf5f7dd944e05.pdf
    • https://static.usrfiles.com/ugd/599026_9c954a06cc8b4858948552da6b98237e.pdf
    • https://static.usrfiles.com/ugd/9b7d8a_df6b7f7688674f6fa624d08c44fd49ca.pdf
    • https://static.usrfiles.com/ugd/f967ac_a56a55bd706b4796bfc67a52d999846f.pdf
    • https://static.usrfiles.com/ugd/ae15ca_b88074c3c2f845c4bf2770c652daaee6.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_off0000ca7c.bin
4546e44b0d99a82245d4a48be1c6ea93e140a21a353d1564e74aa989ee525ceb
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA7C 5044 bytes
font_01_sfnt_off0000dbaf.bin
164cab7187f519edf87db0d6558544d1022a072df9c0bfcace2911b45966fcf2
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAF 10708 bytes