Malicious PDF — malware analysis report

Static analysis result for SHA-256 59a0decd6327de51…

MALICIOUS

PDF

41.7 KB Created: 2020-08-18 18:08:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e56771455acf94e02ebb351c03b49b14 SHA-1: d454fd6cad60fb2a5df60a94339b7936e7635fc8 SHA-256: 59a0decd6327de51bc64e92f738255994c5f44736505b80d52bec7d2128b892a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to external resources. One critical heuristic firing indicates that the PDF links to known malicious redirector infrastructure, specifically 'https://ttraff.cc/pify?keyword=answers+bible+curriculum+teacher+digital+resources'. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to redirect users to potentially harmful sites. The ML classifier strongly supports the malicious nature of this PDF.

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=answers+bible+curriculum+teacher+digital+resources
    • http://zipin.tomsarloart.com/uploads/1/3/1/1/131164159/70f19be9.pdf
    • http://files.theoreticalbuddhist.com/uploads/1/3/0/9/130969371/zenepewivu_xiziwo_laxorojef.pdf
    • http://muwob.mainetwpadultlearning.com/uploads/1/3/1/4/131406086/fadusekotinuropu.pdf
    • http://files.phoenix-wellspan.com/uploads/1/3/1/8/131856772/felavosudegatufetax.pdf
    • https://cdn.shopify.com/s/files/1/0435/1747/7019/files/small_bowel_obstruction_treatment_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0434/5207/2086/files/sopibematatokezadoniwem.pdf
    • https://cdn.shopify.com/s/files/1/0430/3595/1257/files/23366127967.pdf
    • https://cdn.shopify.com/s/files/1/0435/9025/4749/files/apprendre__dessiner_avec_autocad.pdf
    • https://cdn.shopify.com/s/files/1/0433/4646/0840/files/bubalas.pdf
    • https://cdn.shopify.com/s/files/1/0432/2977/3982/files/negibilaxeva.pdf
    • https://cdn.shopify.com/s/files/1/0430/9227/9460/files/74006589901.pdf
    • https://cdn.shopify.com/s/files/1/0430/6694/9786/files/kalawujuv.pdf
    • https://cdn.shopify.com/s/files/1/0440/6099/9845/files/bookmark_preview_mac.pdf
    • https://cdn.shopify.com/s/files/1/0433/3423/8362/files/58698722806.pdf
    • https://cdn.shopify.com/s/files/1/0448/0640/6295/files/33110162941.pdf
    • https://cdn.shopify.com/s/files/1/0427/4988/6620/files/lukutiwa.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_off00006367.bin
a0aaf3feffeac5b25f3eafbb559dff94e67883ef05c11cf9942824680aa18bd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6367 5572 bytes
font_01_sfnt_off00007630.bin
4fda7716845e45a021cebdba30db47d4678735d5882eb2aaf14250a3783d88d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7630 10568 bytes

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