Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9f9adeafc8b5700…

MALICIOUS

PDF

39.4 KB Created: 2020-08-30 02:05:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f3e77c57fae3203016f2b931633674e8 SHA-1: 327f8f4b50a3dcb00fc3e2e0ba6faec25204d781 SHA-256: c9f9adeafc8b5700e8ed62d37653876c1b80235237e23a26effbf406189ecdbe
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector. The primary malicious URL identified is https://ttraff.com/wix?keyword=adverb+examples+sentences+ks2. The document body, though heavily obfuscated, also contains this URL, suggesting a lure to a malicious site. The ML classifier also strongly flagged this PDF as malicious.

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=adverb+examples+sentences+ks2
    • https://cdn.shopify.com/s/files/1/0431/0233/9232/files/logo_quiz_answers_level_3_logo_22.pdf
    • https://cdn.shopify.com/s/files/1/0436/8341/4169/files/lagogefizokij.pdf
    • https://cdn.shopify.com/s/files/1/0429/8863/4263/files/sivebu.pdf
    • https://static.usrfiles.com/ugd/b8c837_b7381071972346f296888b70f5ad0415.pdf
    • https://static.usrfiles.com/ugd/fd7405_580b3a87255c4fe6a1f5eab76839e64b.pdf
    • https://static.usrfiles.com/ugd/8d57bd_7567ee9b6083442d902acac9b3ec396f.pdf
    • https://static.usrfiles.com/ugd/b8c837_576b572585034db998e9fea34c285dc0.pdf
    • https://static.usrfiles.com/ugd/be19e1_455d247bbf29429bb2e623bced8c1418.pdf
    • https://static.usrfiles.com/ugd/b8c837_dd18479d109d46de85fd67a53b13a2f3.pdf
    • https://static.usrfiles.com/ugd/c1615c_06e4b80cba53435ea4e778aad43a8aed.pdf
    • https://static.usrfiles.com/ugd/3e87bf_f8acdd0bb8c64a95ba31460ad61fc825.pdf
    • https://static.usrfiles.com/ugd/b5472a_04bd1c15fb834d4baa0ce4cf53dcf732.pdf
    • https://static.usrfiles.com/ugd/91e123_458ec58aae49454685d7e4947731319d.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004e2f.bin
41af9ea8ad7966a5a08c2247d1a6af68e0c92bc825c7bec11e68e9d60642a9bc
pdf-font-stream PDF embedded font (sfnt) at offset 0x4E2F 5300 bytes
font_01_sfnt_off00006015.bin
a12181f6a028826c832f081c66255314990e13e864562f774e4bc040d1c3e981
pdf-font-stream PDF embedded font (sfnt) at offset 0x6015 9740 bytes
font_02_sfnt_off00008161.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x8161 4324 bytes