Malicious PDF — malware analysis report

Static analysis result for SHA-256 280aba472b596f90…

MALICIOUS

PDF

69.9 KB Created: 2020-08-14 02:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1396ad75935083da68f11f054e14ede4 SHA-1: c10387dc300415c55ef2ce1ea1ac9ef4b4da0d21 SHA-256: 280aba472b596f90f7c2ecb7aa1fbf623093851d52417b387bb5c8b80b467e55
152 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains text related to 'estatistica inferencial exercicios resolvidos pdf' and a URL that aligns with the malicious redirector heuristic. The ML classifier strongly indicates maliciousness, and the overall structure suggests a link farm or phishing 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.cc/wb?keyword=estatistica%20inferencial%20exercicios%20resolvidos%20pdf
    • http://tonibete.swindonmanandvan.com/uploads/1/3/2/8/132815094/1260253.pdf
    • http://files.robspechtart.com/uploads/1/3/0/8/130814516/govabul_pokesoxutoreve_fafavevukeb_zidawevopunu.pdf
    • http://files.newcastlenetworkinggroup.com/uploads/1/3/0/8/130813887/90ec99c3.pdf
    • http://files.peggythomasclayart.com/uploads/1/3/0/7/130739892/9140733.pdf
    • http://files.isaakthetutor.com/uploads/1/3/1/8/131856134/8308844.pdf
    • https://cdn.shopify.com/s/files/1/0433/7847/5162/files/open_hosts_file.pdf
    • https://cdn.shopify.com/s/files/1/0432/5824/9380/files/fesazavugepimigokediv.pdf
    • https://cdn.shopify.com/s/files/1/0447/9077/5965/files/wadosavajonubefuganol.pdf
    • https://cdn.shopify.com/s/files/1/0430/1488/1433/files/sogow.pdf
    • https://cdn.shopify.com/s/files/1/0434/0734/3779/files/wulelig.pdf
    • https://cdn.shopify.com/s/files/1/0433/8260/3927/files/79259096508.pdf
    • https://cdn.shopify.com/s/files/1/0440/7646/6328/files/stop_nox_from_installing_random_apps.pdf
    • https://cdn.shopify.com/s/files/1/0431/8619/2546/files/46250148095.pdf
    • https://cdn.shopify.com/s/files/1/0432/4117/7248/files/minineb.pdf
    • https://cdn.shopify.com/s/files/1/0431/6427/0743/files/44831900788.pdf
    • https://cdn.shopify.com/s/files/1/0434/8837/9032/files/lezuxefifijefe.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/
    • https://cdn.shopify.com/s/files/1/0432/5

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a405.bin
b7be74fbb2d36237338c84d0313027823be61b2741340031ca04dfcc2bbd3de3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA405 2824 bytes
font_01_sfnt_off0000afa1.bin
97bf173d30656f728df9d44a8a46b01b9a4725b80c6cf6d6140f0f8af0c30bc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFA1 5236 bytes
font_02_sfnt_off0000c17e.bin
de120003ef7f95cc9267b41faf91d5159ee196d319683e3c47bc661345079539		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC17E 17076 bytes
font_03_sfnt_off0000f481.bin
9f6d3003b281a24936fb23404abbb72d950ee518ad195daffe5a9caf4f0e74b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF481 16084 bytes

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