Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0c4ab6b11020174…

MALICIOUS

PDF

41.8 KB Created: 2020-09-02 06:24:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3b3faf614be64e9fb19ead4620ac38a6 SHA-1: 850cbc23233506d9575b67b9392c18106836fe56 SHA-256: c0c4ab6b11020174853af704a25846507893403d2e9629ab8ac9fcbb33635f9c
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.ru/wix?keyword=space+invaders++rom'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, many pointing to static.usrfiles.com. The document body, though heavily obfuscated, contains the same redirector URL. This suggests the primary goal is to redirect the user 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=space+invaders++rom
    • https://static.usrfiles.com/ugd/5a4aad_3d957266674a40a1be38a852436a9db6.pdf
    • https://static.usrfiles.com/ugd/529dbf_203847a3291b4306ad876b56f383953d.pdf
    • https://static.usrfiles.com/ugd/37987b_c0e83d0ccfde4f95a911c963a0734e95.pdf
    • https://static.usrfiles.com/ugd/01bc73_119ea3e22b994a2c8ce5f68f3352e96f.pdf
    • https://static.usrfiles.com/ugd/3b0c81_5ea172c12d50407faa876b6f3ad39f55.pdf
    • https://cdn.shopify.com/s/files/1/0432/7086/5052/files/35818046405.pdf
    • https://cdn.shopify.com/s/files/1/0429/2539/2035/files/formal_dresses_chico_ca.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/3215656586.pdf
    • https://static.usrfiles.com/ugd/ea5d7b_e6dbf1cb88b94759b1baae69937e3e27.pdf
    • https://static.usrfiles.com/ugd/516574_e6e336939a2a46a8bcafee5b23f913d3.pdf
    • https://static.usrfiles.com/ugd/b98abb_b4e68cca722140788d771a489387851c.pdf
    • https://cdn.shopify.com/s/files/1/0437/6051/7274/files/diabetes_telugu_books_free.pdf
    • https://cdn.shopify.com/s/files/1/0460/4126/8388/files/rejupekobebewiwitebito.pdf
    • https://cdn.shopify.com/s/files/1/0433/4364/2773/files/poster_template_for_scientific_presentation.pdf
    • https://cdn.shopify.com/s/files/1/0435/4444/5092/files/best_buy_samsung_android_phones.pdf
    • https://cdn.shopify.com/s/files/1/0429/6923/5619/files/goweboruvol.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_off00005b80.bin
1a65e759761d9918041d4b02615f65254fefe4c37e1dd132ea26bb572a243436		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B80 5352 bytes
font_01_sfnt_off00006d9d.bin
7d62320d076f2ea442e781dc1c46a4c4b974443e72bcaee53b559389360bf488		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D9D 14440 bytes

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