Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd92a340bb544087…

MALICIOUS

PDF

42.2 KB Created: 2020-08-31 19:24:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 43d483ba9da79a333d432ed54cbb8497 SHA-1: 5a5ed2f2027a8aba611118fd5dae077771eca818 SHA-256: dd92a340bb54408778327232c04578645f9599d8fa40ed6847ef31209cd2dfc8
120 Risk Score

Malware Insights

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

The PDF file contains a prominent link to 'ttraff.club' which is flagged as a malicious redirector. The document body, though partially corrupted, contains text related to 'Udemy app for android free', suggesting a social engineering lure. The PDF also contains a large number of external links, many pointing to static.usrfiles.com, indicating a link farm strategy to potentially obscure the malicious redirector.

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.club/wix?keyword=udemy+app+for+android+free
    • https://static.usrfiles.com/ugd/37321e_12959e41f89142d9b45821560edc6d91.pdf
    • https://static.usrfiles.com/ugd/b8c837_dacb405f5c0948269e918c9157dbddd1.pdf
    • https://static.usrfiles.com/ugd/d162e3_fda3bc7f80904186ab11465630315b88.pdf
    • https://static.usrfiles.com/ugd/b8c837_60a2b0324e5e4562ad4f5ea1b57b51ee.pdf
    • https://static.usrfiles.com/ugd/0fdb6d_604f5848875044d4b4e850e96c00d05c.pdf
    • https://cdn.shopify.com/s/files/1/0432/9819/3573/files/xunajixobakelutuganudax.pdf
    • https://cdn.shopify.com/s/files/1/0429/0609/1673/files/python3_http_server.pdf
    • https://static.usrfiles.com/ugd/44b221_94ce93fcdc0b46248aed6ef35eb776df.pdf
    • https://static.usrfiles.com/ugd/b8c837_d26cb12c52a44130914d4c5577b4c534.pdf
    • https://static.usrfiles.com/ugd/b8c837_fd94466f002a4d71b0dbd995b4942e0e.pdf
    • https://static.usrfiles.com/ugd/63d3ad_8289595e051d48a3899c18f39d3befa2.pdf
    • https://static.usrfiles.com/ugd/7f46b5_0ce58fde473c4801beed5b50c07b4185.pdf
    • https://static.usrfiles.com/ugd/e2f197_79b56abb7b6f4f06a4e5386c5315f1c7.pdf
    • https://static.usrfiles.com/ugd/b8c837_cd0df82da68746e39996f5a9de575e1d.pdf
    • https://static.usrfiles.com/ugd/b8c837_36c939219dcd4e2ba3d00a4f8ec0ad36.pdf
    • https://static.usrfiles.com/ugd/b8c837_a5dd74ee3ad4427f93df57699b33fe1d.pdf
    • https://static.usrfiles.com/ugd/96768c_73ae3ff79eba45869f9811ff633b4721.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_off0000667c.bin
8a7d2589016a1c33e36c2e704c9244253ce10f3af77e112d91fe96718d70f760		 pdf-font-stream PDF embedded font (sfnt) at offset 0x667C 5068 bytes
font_01_sfnt_off000077b1.bin
131d8b90f2273755011aab622d6eb14aa7de0ad6518d37a178b1165c6b7ee796		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77B1 10652 bytes

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