Malicious PDF — malware analysis report

Static analysis result for SHA-256 84872e0148b2a6b0…

MALICIOUS

PDF

40.1 KB Created: 2020-08-30 05:44:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6da20d1aec52f2dfb339df5d862ce155 SHA-1: 2f8453091c04f74f608dd0c76cc95a2db7df08d5 SHA-256: 84872e0148b2a6b040be65eb67dbf06e1fcc5f1f38d76d287f4e738f777f8fc5
120 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with a critical heuristic firing indicating a link farm and another identifying a redirector link to 'ttraff.com'. The document body, though heavily obfuscated, contains text related to 'acs analytical chemistry exam study' and the redirector URL, suggesting a lure to a potentially malicious or spam-related site. The primary attack pattern involves tricking the user into clicking on these links.

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=acs+analytical+chemistry+exam+study
    • https://cdn.shopify.com/s/files/1/0432/4071/8496/files/formel_areal_av_sirkel.pdf
    • https://cdn.shopify.com/s/files/1/0427/5575/2103/files/26453030015.pdf
    • https://cdn.shopify.com/s/files/1/0432/7319/1588/files/fisheries_and_aquaculture_books.pdf
    • https://cdn.shopify.com/s/files/1/0434/4643/6006/files/mastodon_blood_and_thunder.pdf
    • https://cdn.shopify.com/s/files/1/0428/6296/8991/files/botany_books_for_bsc_first_year.pdf
    • https://static.usrfiles.com/ugd/cac9e4_1d565576e496489bb4330116edfb1bf5.pdf
    • https://static.usrfiles.com/ugd/b8c837_66d5e0cfcc704aba89cca66765024ea0.pdf
    • https://static.usrfiles.com/ugd/07ef24_b75f6f47af7e477d986faff72c473a10.pdf
    • https://static.usrfiles.com/ugd/136d07_6145795246b8493e92d586af5b8976b7.pdf
    • https://cdn.shopify.com/s/files/1/0428/2767/7852/files/warefikesotoro.pdf
    • https://cdn.shopify.com/s/files/1/0428/5513/7447/files/manuv.pdf
    • https://cdn.shopify.com/s/files/1/0436/6653/8649/files/47502775167.pdf
    • https://cdn.shopify.com/s/files/1/0430/1671/6437/files/denodezifez.pdf
    • https://static.usrfiles.com/ugd/8127dd_fbd72a7493794235b0b0ab878c272acf.pdf
    • https://static.usrfiles.com/ugd/b8c837_835c1276d6614d6c9616b40e197738c1.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_off00005d49.bin
42b3417b11392ff822a02c715d0ae2fab01b3d38699a22f858816038dab54817		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D49 5340 bytes
font_01_sfnt_off00006f41.bin
895734b2aec4148eda134d490e313a231dfee38601b8b2a8b52053a08881472d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F41 10504 bytes

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