Malicious PDF — malware analysis report

Static analysis result for SHA-256 876e5767bd609f02…

MALICIOUS

PDF

49.2 KB Created: 2020-09-09 21:49:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8754669e790048a02137ea8520bf02e8 SHA-1: 4f177b5b66cd9a4d2e130bd94eaad7aad02c0ae7 SHA-256: 876e5767bd609f027743ffa790b672c63e9b86b8a6f62164d3f462bddb6fba08
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to a redirector service. The primary malicious URL identified is https://ttraff.link/wix?keyword=amcharts+3+date+format, which is flagged as malicious. The document body, though heavily obfuscated, also contains this URL and other benign-looking PDF links, suggesting a link farm or SEO poisoning attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.link/wix?keyword=amcharts+3+date+format
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/185811_52e017e204524894a5a84bf72a6aea32.pdf
    • https://static.usrfiles.com/ugd/6a4619_f3da297708d94d91a48f2f24c2571480.pdf
    • https://static.usrfiles.com/ugd/3aee12_09a1f4fba9d34db094398640300b2916.pdf
    • https://static.usrfiles.com/ugd/b8c837_9e0065230e734c89bf394a82127e6c96.pdf
    • https://static.usrfiles.com/ugd/516793_60aeba465dcf480a956736dfed4a7fd7.pdf
    • https://static.usrfiles.com/ugd/d78803_ee15a88f8f4d49f38bb7a7ed31cf58b1.pdf
    • https://static.usrfiles.com/ugd/ba2c19_c75c86bb7a3b4ddd9c5e4a705af87c81.pdf
    • https://static.usrfiles.com/ugd/fdee49_ab0678ca40db4815bc4901171af65871.pdf
    • https://static.usrfiles.com/ugd/9b33c5_dc26e4c91ddf4f50b14dec5b37de746b.pdf
    • https://static.usrfiles.com/ugd/003b86_006a34ce8cdd4d27a3c7703551b9eb74.pdf
    • https://static.usrfiles.com/ugd/b8c837_0b59d6537ef348f5a778430726f63811.pdf
    • https://static.usrfiles.com/ugd/b8c837_ee79441fcde94d45a23488ab8aedfa4d.pdf
    • https://static.usrfiles.com/ugd/b27199_21240f105abf4fec97976e5eda99788f.pdf
    • https://static.usrfiles.com/ugd/f17c08_8caeb311c1cf49d3b1e085aadac246c7.pdf
    • https://static.usrfiles.com/ugd/a2e20a_083bba04c0a14ee99d6fccffc0fe5921.pdf
    • https://cdn.shopify.com/s/files/1/0438/4954/7936/files/create_emulator_in_android_studio_ubuntu.pdf
    • https://cdn.shopify.com/s/files/1/0429/6340/2905/files/duxirazavogaruje.pdf
    • https://cdn.shopify.com/s/files/1/0434/7097/9238/files/muzexugirasori.pdf
    • https://cdn.shopify.com/s/files/1/0429/0206/1215/files/ap_module_10.pdf
    • https://cdn.shopify.com/s/files/1/0433/2794/6904/files/pafidikowu.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000820c.bin
16065f894793a1aaa045f59170bd309534c4a5374ea0db144b6f013149339441		 pdf-font-stream PDF embedded font (sfnt) at offset 0x820C 5380 bytes
font_01_sfnt_off00009429.bin
033a17c68670fbc2ff3d498e1632fb47f4efc19c14fb09e42d234781ab431659		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9429 10252 bytes

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