Malicious PDF — malware analysis report

Static analysis result for SHA-256 663e7c568ff4180d…

MALICIOUS

PDF

103.1 KB Created: 2020-08-03 18:24:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e023949ca4b4f0e581de8227ca1f964 SHA-1: ee0ec2bfcb4265964bb8cd645ab458cd4e0f54da SHA-256: 663e7c568ff4180d6bcc3a5bf4d08ac14bcacf9a8d6f8b0b3c99f9fdf9deb015
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which are designed to appear as legitimate PDF files but redirect to malicious infrastructure. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically identifies a link pointing to ttraff.cc, a known malicious redirector. The PDF_SEO_LINK_FARM heuristic indicates a mass external PDF link farm, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier also strongly indicates maliciousness.

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=auditoria+administrativa+ejemplo+pdf
    • http://files.howfarmswork.com/uploads/1/3/1/4/131437969/dekekop.pdf
    • http://files.tompa-fg.com/uploads/1/3/2/6/132695828/4841273.pdf
    • http://files.brialee.com/uploads/1/3/1/6/131637374/kudunitukenimeb.pdf
    • http://files.laraodwyerbrown.com/uploads/1/3/0/8/130814003/pajidatanov.pdf
    • http://files.mredwardsclassroomhomepage.com/uploads/1/3/1/4/131483097/9306920.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/7058/6022/files/rufelafedukarape.pdf
    • https://cdn.shopify.com/s/files/1/0435/1046/4667/files/10963956029.pdf
    • https://cdn.shopify.com/s/files/1/0431/0836/8545/files/minecraft_song_revenge.pdf
    • https://cdn.shopify.com/s/files/1/0429/1274/3591/files/folajas.pdf
    • https://cdn.shopify.com/s/files/1/0433/4410/1544/files/95392747409.pdf
    • https://cdn.shopify.com/s/files/1/0434/6888/2072/files/30996969846.pdf
    • https://cdn.shopify.com/s/files/1/0438/0744/1053/files/sullair_compressors_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/8691/3439/files/29470383708.pdf
    • https://cdn.shopify.com/s/files/1/0433/5327/6574/files/zutejopevonalufasora.pdf
    • https://cdn.shopify.com/s/files/1/0434/3591/7464/files/tutajibuzujakopewa.pdf
    • https://cdn.shopify.com/s/files/1/0432/8072/8224/files/jukisos.pdf
    • https://cdn.shopify.com/s/files/1/0431/2013/2247/files/31599039830.pdf
    • https://cdn.shopify.com/s/files/1/0437/4619/7653/files/venofipituwa.pdf
    • https://cdn.shopify.com/s/files/1/0437/3449/9479/files/weider_ultimate_body_works_exercise_chart.pdf
    • https://cdn.shopify.com/s/files/1/0430/9303/3117/files/65660822479.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_off00014820.bin
994b8109fe24478072bbf0ef0528e1a565e6965b87f40e76212b76656b0fcd83		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14820 5312 bytes
font_01_sfnt_off00015a28.bin
03b5f87ccfba37c02a52b857104956e2de5c19c0ccc6396b9a361c57d814bc4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15A28 17268 bytes

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