Malicious PDF — malware analysis report

Static analysis result for SHA-256 1748ef09ae53045b…

MALICIOUS

PDF

45.5 KB Created: 2020-08-08 16:47:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12389b9fcae4c9d681feafb7270a170e SHA-1: 0cfdd53a91ab00f8afb7f333073fe588b8dc8ab2 SHA-256: 1748ef09ae53045b686b910685771384d18ed954d83e0b3733b4ae600de2c1d6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector service known to host malicious content. The document body, though heavily obfuscated, contains text related to 'mathematics questions and answers pdf grade 12' and includes the primary malicious URL, suggesting a lure to external, potentially harmful, resources. The ML classifier 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.cc/pify?keyword=mathematics+questions+and+answers+pdf+grade+12
    • http://files.montenegromotel.com/uploads/1/3/2/6/132683154/2093393.pdf
    • http://nejegog.sharadslunchbox.com/uploads/1/3/1/8/131856318/nezipijinufetojadu.pdf
    • http://bimil.fresnotreeservicecompany.com/uploads/1/3/1/4/131483371/1978acb5.pdf
    • http://files.alittlebitofhappy.org/uploads/1/3/1/0/131071114/7463915.pdf
    • http://files.sitimeline.com/uploads/1/3/1/4/131453054/palukinazikolete.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/6828/3298/files/beethoven_pathetique_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0437/3345/0903/files/41193000416.pdf
    • https://cdn.shopify.com/s/files/1/0431/7449/4369/files/37747425974.pdf
    • https://cdn.shopify.com/s/files/1/0441/1781/9544/files/special_occasion_speech_examples.pdf
    • https://cdn.shopify.com/s/files/1/0440/0611/3430/files/mepofuzinibujizejubapoz.pdf
    • https://cdn.shopify.com/s/files/1/0440/6562/0118/files/xevarokib.pdf
    • https://cdn.shopify.com/s/files/1/0429/9735/0554/files/wagukudaraxiw.pdf
    • https://cdn.shopify.com/s/files/1/0432/8249/7696/files/48782683577.pdf
    • https://cdn.shopify.com/s/files/1/0430/7091/4717/files/26125028729.pdf
    • https://cdn.shopify.com/s/files/1/0430/9227/9460/files/radatamuporaze.pdf
    • https://cdn.shopify.com/s/files/1/0432/4474/8950/files/papuzosuloxekufesit.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066be.bin
fec0b4d5a9a4abce95389e564f7dc39b338eaa5d160eaec96f3cd44a76ecfea4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66BE 5944 bytes
font_01_sfnt_off00007aeb.bin
801e5dbe00ccd1731ced461490b150e4818ae37bbf23863bf69c994a127d9eed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AEB 14880 bytes

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