Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa23950531d187a4…

MALICIOUS

PDF

45.8 KB Created: 2020-08-12 22:42:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e5e82abafabe86a85abd2ce6438656e SHA-1: 2ac52215dc62039734bb7bc109d1c5d2e729e118 SHA-256: fa23950531d187a41edec6bedc1fcd0cd2d4251ba31a90e81a003c44e18dbc31
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com. One of these links, https://ttraff.ru/pify?keyword=bible+american+standard+version+pdf, is identified as a malicious redirector. The document body, though heavily obfuscated, contains the same malicious URL, suggesting the primary intent is to redirect users to malicious infrastructure.

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.ru/pify?keyword=bible+american+standard+version+pdf
    • http://files.amandajanedavies.com/uploads/1/3/1/6/131606984/ab4e83417243d6.pdf
    • http://files.snohomishmidwives.com/uploads/1/3/2/3/132302759/kifemude_bakuxura_bajaki.pdf
    • http://files.maggieknaus.com/uploads/1/3/1/4/131455956/mikokovasirufo-nevud-lirib.pdf
    • http://lozasaxid.emeraldbeachpizzapasta.com.au/uploads/1/3/1/0/131070450/vawadukiganuw.pdf
    • https://cdn.shopify.com/s/files/1/0432/2004/1886/files/joripenokigaz.pdf
    • https://cdn.shopify.com/s/files/1/0427/5906/1670/files/mumupisaseruvisuwa.pdf
    • https://cdn.shopify.com/s/files/1/0430/3729/4754/files/22270996556.pdf
    • https://cdn.shopify.com/s/files/1/0431/0145/4496/files/dojizewovinomiwewof.pdf
    • https://cdn.shopify.com/s/files/1/0430/1763/3945/files/sawonadovopozuwem.pdf
    • https://cdn.shopify.com/s/files/1/0435/6882/4488/files/nukutesajugusagimavike.pdf
    • https://cdn.shopify.com/s/files/1/0433/3800/6686/files/notuzonox.pdf
    • https://cdn.shopify.com/s/files/1/0432/1270/1854/files/21917081515.pdf
    • https://cdn.shopify.com/s/files/1/0431/9330/3204/files/66469386323.pdf
    • https://cdn.shopify.com/s/files/1/0434/0737/6542/files/asme_boiler_and_pressure_vessel_code_section_ix.pdf
    • https://cdn.shopify.com/s/files/1/0431/9107/4976/files/english_vocabulary_list_with_meaning_in_urdu.pdf
    • https://cdn.shopify.com/s/files/1/0433/9931/5610/files/segup.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/
    • https://cdn.shopify.com/s/files/1/0432/2004/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000074a4.bin
004dda0b02f60d033e280f290e739c3bdc3af8e84fb397f764dd93b0b520111a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74A4 5548 bytes
font_01_sfnt_off00008767.bin
53dcf5b263516e84ced90bc31e66b0513fff3169ac1f56089157ca3d9bef5a93		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8767 10064 bytes

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