Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7aa77500cd9b36d…

MALICIOUS

PDF

39.0 KB Created: 2020-08-14 16:22:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21132a116cfcdc13abe0e46e23ba8254 SHA-1: 92e3bb73af9858e25c87f5d62838a7dbc78136d1 SHA-256: b7aa77500cd9b36d6d27e33a60bb2d0c4fe18978ce7d163886e921a071c7e46c
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as Louis Armstrong piano sheet music. The PDF_MALICIOUS_REDIRECTOR_LINK heuristic and the embedded URL confirm the malicious intent. The ML_NYX_PDF_MALICIOUS classifier strongly indicates maliciousness. The document body, though partially corrupted, contains the lure text and the malicious URL.

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=louis+armstrong+piano+sheet+music
    • http://files.staceyagdern.com/uploads/1/3/0/7/130775679/lewubinareg_gizuke.pdf
    • https://cdn.shopify.com/s/files/1/0439/6145/0654/files/cultivo_de_cebolla_china_en_peru.pdf
    • https://cdn.shopify.com/s/files/1/0438/1258/5634/files/atomic_bomb_design.pdf
    • https://cdn.shopify.com/s/files/1/0430/8716/7645/files/mozaxemajubu.pdf
    • https://cdn.shopify.com/s/files/1/0438/4597/6224/files/8851891118.pdf
    • https://cdn.shopify.com/s/files/1/0434/8434/8569/files/kinasukewivusurupepegoj.pdf
    • https://cdn.shopify.com/s/files/1/0432/6037/9286/files/vobipaje.pdf
    • https://cdn.shopify.com/s/files/1/0435/6092/7393/files/57527162981.pdf
    • https://cdn.shopify.com/s/files/1/0431/3815/4653/files/madij.pdf
    • https://cdn.shopify.com/s/files/1/0432/6385/2712/files/43136229329.pdf
    • https://cdn.shopify.com/s/files/1/0445/4429/5076/files/accounting_ledger_book.pdf
    • https://cdn.shopify.com/s/files/1/0430/1442/2677/files/fumutajadofokekonir.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_off00005adf.bin
e9993fb80e6d691844a0cbcc988362bb242193aeea5a59fe61983255fbd7fbbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5ADF 5256 bytes
font_01_sfnt_off00006c9b.bin
842003f98d9cccda1397ae7d01685bdc651d5e2bca349f0612f586a8e0417527		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C9B 10152 bytes

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