Malicious PDF — malware analysis report

Static analysis result for SHA-256 87d90a6040a36a3b…

MALICIOUS

PDF

45.6 KB Created: 2020-08-31 03:45:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c25aeeda3f7c293bca98ad32d5cdd431 SHA-1: c1833597655b3e7a483c62eb43339e5cef5d8132 SHA-256: 87d90a6040a36a3b98324197084172bc865ea95e1736f17df770aeb86e01b56a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.com, which is designed to lead users to malicious content. The document body, though heavily obfuscated, contains keywords related to 'Time Warner Cable remote control codes' and references the wkhtmltopdf tool, suggesting a lure to a phishing or scam page. The presence of numerous external PDF links, many pointing to static.usrfiles.com, indicates a link farm strategy, likely to improve SEO for 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.com/wix?keyword=time+warner+cable+remote+control+codes
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/2d1648_dd7b615271494aa9bf52fc4d883eac51.pdf
    • https://static.usrfiles.com/ugd/b7306e_c05b2de961dd496a9a097a7eb6b5a09d.pdf
    • https://static.usrfiles.com/ugd/89064d_ded1572c28f44718905c33c75694b741.pdf
    • https://static.usrfiles.com/ugd/b8c837_2aa03b9f0ca9473d926d453b326addf1.pdf
    • https://static.usrfiles.com/ugd/87d215_b29b1254f99e4d1bacdd62986ca5cf89.pdf
    • https://static.usrfiles.com/ugd/f09a9d_f1820b44d07546829537e1439bbdebce.pdf
    • https://static.usrfiles.com/ugd/b88e3d_e68bcd6095ed41c696477a579fb5ded5.pdf
    • https://static.usrfiles.com/ugd/df4650_7d146642711a41d3a29e69b08c51492c.pdf
    • https://cdn.shopify.com/s/files/1/0431/3559/8758/files/gelimifejesepiputukomim.pdf
    • https://cdn.shopify.com/s/files/1/0428/9105/1161/files/reduce_size_mac_free.pdf
    • https://cdn.shopify.com/s/files/1/0439/1780/3675/files/bufoguran.pdf
    • https://cdn.shopify.com/s/files/1/0432/1578/2048/files/79938769642.pdf
    • https://cdn.shopify.com/s/files/1/0428/8030/3267/files/90289247061.pdf
    • https://static.usrfiles.com/ugd/724bd4_fa915ba9e59445c7830079939748d405.pdf
    • https://static.usrfiles.com/ugd/b8c837_b66af327c13643228fe2a10cfe26f05c.pdf
    • https://static.usrfiles.com/ugd/538d67_98398f02c80c42e8b39b79b973355632.pdf
    • https://static.usrfiles.com/ugd/32777b_a8cdd79d65cd40878b6b1054a6f37257.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_off0000717d.bin
1d3f88f33c28e85a804a63aaff759b51833e38103383010102b22d997dbb763c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x717D 5264 bytes
font_01_sfnt_off0000834d.bin
aea7fc63c7d3076aaaa03cd709415806758f2b849c94e156f6670b29f665056d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x834D 11080 bytes

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