Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8df49cdf0487fc0…

MALICIOUS

PDF

40.5 KB Created: 2020-08-31 04:21:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 81e2c7e1a873af222fefbed1e3d72719 SHA-1: 4749ef0d02423346b5de662c890d08a5f492c94d SHA-256: d8df49cdf0487fc01508409869a5c5e8d296414325b4515f28fa985cecf12876
120 Risk Score

Malware Insights

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

The PDF file was identified as malicious due to the presence of a large number of embedded links, many of which lead to a redirector. The primary malicious URL identified is https://ttraff.cc/wix?keyword=direct+indirect+speech+interrogative+exercise. The document body contains garbled text and references to wkhtmltopdf, suggesting it was programmatically generated. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK strongly indicates a phishing or redirection attempt.

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=direct+indirect+speech+interrogative+exercise
    • https://static.usrfiles.com/ugd/8acad3_7cb1bf2bac494a9ebcd9dead73ed80b5.pdf
    • https://static.usrfiles.com/ugd/e23fbb_a8991d97bab74628a98d91603599f6b1.pdf
    • https://static.usrfiles.com/ugd/b8c837_5ac3ee028dd74febb13802a87a7de7f6.pdf
    • https://cdn.shopify.com/s/files/1/0431/5676/6882/files/blink_182_icon_album_zip.pdf
    • https://cdn.shopify.com/s/files/1/0431/4388/9052/files/food_diary_template_diabetes.pdf
    • https://cdn.shopify.com/s/files/1/0428/0372/4455/files/40532730035.pdf
    • https://cdn.shopify.com/s/files/1/0440/0116/5462/files/einstein_biography_isaacson.pdf
    • https://cdn.shopify.com/s/files/1/0430/5122/1143/files/basic_book_of_chemistry.pdf
    • https://cdn.shopify.com/s/files/1/0428/3429/6988/files/ios_13_public_beta_size.pdf
    • https://cdn.shopify.com/s/files/1/0432/0083/9842/files/basic_math_rules.pdf
    • https://static.usrfiles.com/ugd/95089d_30788d6d02bd4692ad8dcc055e3d2d59.pdf
    • https://static.usrfiles.com/ugd/b8c837_acdbb6ff422f4e5e854f4982dd587dd7.pdf
    • https://static.usrfiles.com/ugd/7baf93_f1d42d80616f4745839b31b64c5fbc89.pdf
    • https://static.usrfiles.com/ugd/73f3b0_be351659477541f0a590267072d580fd.pdf
    • https://static.usrfiles.com/ugd/aff7ca_daa8f15b86ed4e7fa94e51487a07f9e2.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_off00005e0e.bin
70b7c8ebfd407187f8404af93413e1aa82b8f14362e5ad21cc2bb7812c9394c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E0E 5432 bytes
font_01_sfnt_off00007088.bin
cf7c1d86642b4792c34cfd066de4540d2dab73aef03edfc388ae8f1f353136e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7088 10088 bytes

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