Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3e9022847f62122…

MALICIOUS

PDF

81.0 KB Created: 2020-08-10 17:32:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13bdbb47dd940aa5c941a3cef7ea9c12 SHA-1: 9dd778e71ed53e99d5536f5c45793b2931f2aa4f SHA-256: b3e9022847f62122ca0eebead2010afb1e93ea5c4c089a2fd98479fe6ed49ce1
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a significant number of embedded URLs, indicating a link farm designed to redirect users. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=alkanes+lecture+notes+pdf'. The document body appears to be heavily obfuscated or corrupted, but the presence of the URL and the heuristic firings strongly suggest a malicious redirection attempt.

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/pify?keyword=alkanes+lecture+notes+pdf
    • http://files.micahmcgivern.com/uploads/1/3/1/0/131071256/weziximegadegaru.pdf
    • http://files.jboboige.com/uploads/1/3/0/7/130740130/nutopajidisovizawano.pdf
    • http://xudibede.michiesdogmeatsandtreats.com/uploads/1/3/2/6/132695278/7484d75.pdf
    • http://files.avcri.org/uploads/1/3/0/8/130874143/4541112.pdf
    • http://files.4k-karate.com/uploads/1/3/2/8/132815979/ca74e64f902.pdf
    • https://cdn.shopify.com/s/files/1/0430/6688/4250/files/80354311034.pdf
    • https://cdn.shopify.com/s/files/1/0428/4894/4295/files/kexod.pdf
    • https://cdn.shopify.com/s/files/1/0440/3704/6437/files/bezogagazufifowatu.pdf
    • https://cdn.shopify.com/s/files/1/0433/6903/7980/files/notiwozanizu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nuruge.pdf
    • https://cdn.shopify.com/s/files/1/0434/5354/6656/files/job_interview_questions_and_answers_examples.pdf
    • https://cdn.shopify.com/s/files/1/0439/0794/0520/files/sawevozipijebuku.pdf
    • https://cdn.shopify.com/s/files/1/0431/7678/8117/files/free_maya_models.pdf
    • https://cdn.shopify.com/s/files/1/0431/4857/4886/files/essential_calvin_and_hobbes.pdf
    • https://cdn.shopify.com/s/files/1/0428/6549/2127/files/ravabapomipobumopixofomug.pdf
    • https://cdn.shopify.com/s/files/1/0433/1785/4373/files/biology_project_for_class_11.pdf
    • https://cdn.shopify.com/s/files/1/0439/4627/9080/files/plantas_alimentcias_no_convencionais_panc_no_brasil_download.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_off0000f91b.bin
6c8eddf7f46015af7f2f8aed514b9ce06661eee0ecbcd1d161a1d87ba2383e72		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF91B 5200 bytes
font_01_sfnt_off00010ad7.bin
934f8e418341d6a3bb477bfe0856cb5f6ce79d8dc1b0c3e7ca595c0c7ec955c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD7 13792 bytes

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