Malicious PDF — malware analysis report

Static analysis result for SHA-256 889bb3be95141f28…

MALICIOUS

PDF

52.8 KB Created: 2020-09-03 01:06:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 95c9f19e824faaddb3f3dd98f35a195e SHA-1: e316d82738fd1a3fb6dade93fa96320d5517e7f8 SHA-256: 889bb3be95141f28b44e9148861cab7151beb10bdd1db04abbf27eede3a58ae6
120 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with a critical heuristic firing for PDF_SEO_LINK_FARM. One of these links points to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that matches the redirector link. This suggests a campaign to drive traffic to malicious sites or to manipulate search engine results.

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=types+of+active+learning+strategies+pdf
    • https://cdn.shopify.com/s/files/1/0435/3523/7269/files/dish_dash_milpitas.pdf
    • https://cdn.shopify.com/s/files/1/0429/2512/9891/files/topatugaxulonoruludosopo.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/const_int_vs_int_const.pdf
    • https://cdn.shopify.com/s/files/1/0430/9889/8592/files/hess_law_lab_report_answers.pdf
    • https://static.usrfiles.com/ugd/b1277d_83f5978bbe934f58876b480cc7d0b3ec.pdf
    • https://static.usrfiles.com/ugd/57c819_87fbeb6f68354ecfbc3f37b2727030a9.pdf
    • https://static.usrfiles.com/ugd/7e0eb0_4cbe4d710cf94237b81394ed80191108.pdf
    • https://cdn.shopify.com/s/files/1/0428/2023/9519/files/appula_apparao_movie_songs.pdf
    • https://cdn.shopify.com/s/files/1/0437/5832/1818/files/cacingan_adalah.pdf
    • https://cdn.shopify.com/s/files/1/0432/8167/8494/files/585330703.pdf
    • https://static.usrfiles.com/ugd/dc98cc_185ca93a09a1420ea1023061b953ebac.pdf
    • https://static.usrfiles.com/ugd/de3d83_038dfece4b6549f691ccb181ec9bfd2b.pdf
    • https://static.usrfiles.com/ugd/b77b08_fad4045d40e346e698b609de45a5f0b6.pdf
    • https://static.usrfiles.com/ugd/b7082a_9abb874eddcb4a61b5425f87812c7488.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_off00009010.bin
b58c2fc8e3aa3437b19f4aef5348eccc92314b807a710b429cc695f6c0f51cfb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9010 5432 bytes
font_01_sfnt_off0000a2ac.bin
dfb3c62a750a27bce238dc605ba1125156e65e7c55753f38146e529d17d7e3fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA2AC 10452 bytes

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