Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dce3646f3b0f49b…

MALICIOUS

PDF

39.0 KB Created: 2020-08-16 02:29:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc3b8493a75a29b15580fdd960999d94 SHA-1: 6ee149d955f78eb9f47f2efbd87da53c97a9f946 SHA-256: 2dce3646f3b0f49bcfa224154ff9ed0113306bfb84de1681c318ee4b461dccd2
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

This PDF document contains a link farm and a malicious redirector. The primary URL, https://ttraff.ru/wb?keyword=carrier%20inverter%20air%20conditioner%20manual, is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL and numerous other links hosted on cdn.shopify.com, suggesting a tactic to distribute malicious content through a large number of seemingly benign links. No scripts were extracted, but the PDF structure and embedded URLs strongly indicate a malicious intent to redirect the user to harmful 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.ru/wb?keyword=carrier%20inverter%20air%20conditioner%20manual
    • http://files.education4fun.net/uploads/1/3/1/4/131438423/lugelizufedap_sezogibidubez_tukabuj.pdf
    • http://wajusugo.salionline.com/uploads/1/3/2/6/132695742/devurepu.pdf
    • http://teneradez.fbclifepath.org/uploads/1/3/1/1/131164496/fexilutim.pdf
    • http://livekab.aghortteachers.org/uploads/1/3/2/6/132695240/e8078e73.pdf
    • https://cdn.shopify.com/s/files/1/0432/5661/0969/files/ludirekeduzarakiwoxiw.pdf
    • https://cdn.shopify.com/s/files/1/0433/9279/4773/files/mezaxojixaxofokipukibebu.pdf
    • https://cdn.shopify.com/s/files/1/0429/8201/5135/files/xokodolejitosu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0203/5351/files/borobeguwo.pdf
    • https://cdn.shopify.com/s/files/1/0429/0645/2127/files/list_of_andhra_pradesh_state_government_schemes.pdf
    • https://cdn.shopify.com/s/files/1/0436/5379/1909/files/diner_dash_flo_on_the_go.pdf
    • https://cdn.shopify.com/s/files/1/0431/3127/3365/files/22301527725.pdf
    • https://cdn.shopify.com/s/files/1/0428/3482/1287/files/49202383589.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/netila.pdf
    • https://cdn.shopify.com/s/files/1/0428/2390/9532/files/jixomeg.pdf
    • https://cdn.shopify.com/s/files/1/0431/7655/8746/files/guxili.pdf
    • https://cdn.shopify.com/s/files/1/0433/8581/5205/files/76248760445.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_off00005c6f.bin
90f544ead60530f9a304ce523b815bf96da71c7dd22af0c22f73e853e7da2211		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C6F 4872 bytes
font_01_sfnt_off00006ce7.bin
c1d7631483b8c8739e9f01f198d7317cff53dfbb14fe34b6d0e675b1b083c10a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CE7 10144 bytes

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