Malicious PDF — malware analysis report

Static analysis result for SHA-256 add8012c00d62c04…

MALICIOUS

PDF

40.0 KB Created: 2020-08-16 14:03:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c198d4952130b59159f7de273dd71db0 SHA-1: f57f0529620daf1751218d5f3b662934cf73c3c0 SHA-256: add8012c00d62c04e0b26929b0976dd19ad29dff0814eeba85584a01e2f5df0a
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a malicious redirector link disguised as a PDF editor download, aiming to trick users into visiting a malicious site. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM indicate the document's primary purpose is to redirect users to potentially harmful content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=pdf%20editor%20ubuntu%2018.04
    • http://files.darkmattercomposites.com/uploads/1/3/1/3/131398184/fatuvoguwovimob-xoxoxetivon.pdf
    • http://files.rabbitrailsupply.com/uploads/1/3/0/7/130776041/tejagugipeben.pdf
    • http://files.youth.namiscc.org/uploads/1/3/0/7/130775393/6531890.pdf
    • https://cdn.shopify.com/s/files/1/0436/0162/5252/files/agamemnon_script.pdf
    • https://cdn.shopify.com/s/files/1/0432/6640/8603/files/97348768582.pdf
    • https://cdn.shopify.com/s/files/1/0430/9748/9572/files/mods_para_minecraft_1._8_1.pdf
    • https://cdn.shopify.com/s/files/1/0450/3673/2566/files/uses_of_a_liberal_education.pdf
    • https://cdn.shopify.com/s/files/1/0435/7400/1825/files/wordly_wise_3000_book_9_lesson_7_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/43778875991.pdf
    • https://cdn.shopify.com/s/files/1/0439/1501/8392/files/rti_act_amendment_2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/6785/0390/files/megowilu.pdf
    • https://cdn.shopify.com/s/files/1/0429/7634/6266/files/nofeluja.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gejazopemovaro.pdf
    • https://cdn.shopify.com/s/files/1/0434/7274/8709/files/99958611413.pdf
    • https://cdn.shopify.com/s/files/1/0431/6718/7108/files/string_replace_c.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_off00005ec5.bin
128b2746bdffa78e9f4119bd6350960226eba2fff898899e573f58add80b80a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EC5 5128 bytes
font_01_sfnt_off00007056.bin
85348ce37d25b7eb6e75d8a159adbe4c782d167b5560676a68e6a78461ef6fab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7056 10240 bytes

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