Malicious PDF — malware analysis report

Static analysis result for SHA-256 86055eba9dd3bebf…

MALICIOUS

PDF

40.6 KB Created: 2020-08-31 05:43:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9e540de934573f2e043297ddfe9c53ab SHA-1: 800cac4d0e7767025be8f29ff34077469889b09a SHA-256: 86055eba9dd3bebff72e18102ac33b39c52b0edea4fd1c34168640f0727bed60
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and contains a critical heuristic firing for linking to known malicious redirector infrastructure. It also exhibits characteristics of a PDF link farm, with numerous external links embedded within the document body. The primary malicious URL identified is https://ttraff.cc/wix?keyword=liz+clarke+washington+correo+twitter, which is likely used to redirect users to further malicious content or phishing pages.

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.cc/wix?keyword=liz+clarke+washington+correo+twitter
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/ec0c41_e6658660f8a849b5992b7a1edf07d908.pdf
    • https://static.usrfiles.com/ugd/4725f1_b3a9b5c2783e4dba978ba5793126c928.pdf
    • https://static.usrfiles.com/ugd/405339_80bb25a6e743435c9d2743c58df4f360.pdf
    • https://cdn.shopify.com/s/files/1/0431/7963/8942/files/kuwapezudutagoxawawetelaw.pdf
    • https://cdn.shopify.com/s/files/1/0429/7474/0636/files/pofitanuverijoxavujazu.pdf
    • https://cdn.shopify.com/s/files/1/0430/6829/3287/files/vetanonafuzovorojewe.pdf
    • https://cdn.shopify.com/s/files/1/0431/2177/0657/files/davimolesaxiru.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sovir.pdf
    • https://static.usrfiles.com/ugd/804ff6_e32a2023cc0e4b8185b9edcae3d05dcf.pdf
    • https://static.usrfiles.com/ugd/b8c837_bd83b711650c46d0ace2eb252c52e830.pdf
    • https://static.usrfiles.com/ugd/d1d005_f9311fb913894f26b67bedc130752904.pdf
    • https://static.usrfiles.com/ugd/374ce0_759e0dc6e73b475fb4a014fad48f25da.pdf
    • https://static.usrfiles.com/ugd/0a052f_c8160985f594441680cafa668c85a664.pdf
    • https://static.usrfiles.com/ugd/b8c837_9e555a8fb9454e799ab6494884fca9d0.pdf
    • https://static.usrfiles.com/ugd/b8c837_6f6068acbefa42d9a9039bad35eae4bf.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_off00006060.bin
8db62c46362307341821c4046661a482b42c9e51bed0f59a77d6561693358825
pdf-font-stream PDF embedded font (sfnt) at offset 0x6060 5208 bytes
font_01_sfnt_off0000722d.bin
af11b724d16431be9e45cc59d0e5682cd21391e8981cdd2606220bc8d2194272
pdf-font-stream PDF embedded font (sfnt) at offset 0x722D 10384 bytes