Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb38cf8b67cca214…

MALICIOUS

PDF

51.8 KB Created: 2020-08-08 10:40:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec32638610fac97a7077b714df0fc5cd SHA-1: 366d65e6fa4f6f7db87c38d70a3aa5578ba6ffc8 SHA-256: fb38cf8b67cca21430c9097706f16194c3535c359e7516d102b6fc6ea12397cf
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. The primary redirector URL is https://ttraff.com/pify?keyword=project+report+on+electricity+billing+system+pdf. The document body, though heavily obfuscated, also contains this URL and other Shopify-hosted PDF links, suggesting a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to harmful content.

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.com/pify?keyword=project+report+on+electricity+billing+system+pdf
    • http://files.artfeltcollaborative.com/uploads/1/3/1/3/131381693/tinewopuwoweke_fefukep_zokexobe.pdf
    • http://files.school.stmaryspontiac.org/uploads/1/3/1/0/131071117/karar.pdf
    • http://files.vaniteevogue.com/uploads/1/3/2/6/132681443/2974685.pdf
    • http://files.cybersonics.net/uploads/1/3/1/4/131406288/sifosapusuviw.pdf
    • https://cdn.shopify.com/s/files/1/0429/9420/4825/files/70632001267.pdf
    • https://cdn.shopify.com/s/files/1/0431/2258/9853/files/tofazisenape.pdf
    • https://cdn.shopify.com/s/files/1/0431/6892/3799/files/5950086421.pdf
    • https://cdn.shopify.com/s/files/1/0440/7109/2376/files/heathcliff_as_a_byronic_hero_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0433/5003/2549/files/nosuloxotalovitagos.pdf
    • https://cdn.shopify.com/s/files/1/0431/5670/1348/files/kokoduv.pdf
    • https://cdn.shopify.com/s/files/1/0435/4647/6708/files/veranepasavewivosobasodu.pdf
    • https://cdn.shopify.com/s/files/1/0439/8094/7614/files/36770651013.pdf
    • https://cdn.shopify.com/s/files/1/0435/1950/8634/files/27986412427.pdf
    • https://cdn.shopify.com/s/files/1/0434/1891/0870/files/58919820911.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007da5.bin
04eab4b704eada69eda531c755fadbd9f5d5d047763739937089d7f208fdf840		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DA5 5372 bytes
font_01_sfnt_off00008fdc.bin
af46cc41dd0ff265959fe6b292c967b8d5876e133a36ac3c76da38a1c8d66a51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FDC 10604 bytes
font_02_sfnt_off0000b41b.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB41B 4324 bytes

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